So there's this guy who is deeply religious, a FriendToAllLivingThings. Then, one day, he decides there is no {{God}} or tires of his prayers not being answered. [[SmiteMeOhMightySmiter Expect a lot of shouting]]. He [[DespairEventHorizon loses all hope for everything]], including human decency, and now he likes to rape puppies in his spare time.

Obviously, in RealLife, it takes a hell of a lot more than a loss of faith to just drive people to do evil. Done poorly, this can be an outright StrawmanPolitical character to show that religion is supposed to be the sole moral compass for people.

Compare CrisisOfFaith (when someone experiences a much less drastic shift in his personality), HollywoodAtheist, BewareTheNiceOnes, FallenAngel.

When a character who gets religion turns ''good'' as a result, that's a HeelFaithTurn. If a character who gets religion turns ''evil'', it's probably a {{Cult}}, CorruptChurch, PathOfInspiration or outright ReligionOfEvil.

Not to be confused with [[Series/BuffyTheVampireSlayer Faith's]] heel turn; [[JustForPun becoming kill happy has little to do with atheism]].


[[folder:Anime and Manga]]
* Xenovia from ''LightNovel/HighSchoolDxD'' once she learns that [[GodIsDead God died]] during the last war between the angels, [[FallenAngel fallen angels]], and demons. She falls into desperation and turns to Rias for help, who turns her into a devil. Once turned, she attempts to redirect her former faith towards worldly desire (which mostly involves attempting to have sex with Issei), but her inherent piety often wins over, with her constantly praying and thanking God for good things happening, which due to her newfound devilhood, results in giving her sharp migraines (at least until Issei asks the Archangel Michael to give her and Asia special permission).
* The PsychoForHire Akabane of ''Manga/GetBackers'' (AKA [[MorallyAmbiguousDoctorate "Doctor]] Jackal") used to be an actual doctor who saved people, but failed to save the son of a good friend. That is the origin of his current personality.
* In ''Anime/WeissKreuz'', [[ThePsychoRangers Schwarz]]'s resident AxCrazy KnifeNut Farfarello started out as a devout Catholic child, but when he learned that he was adopted and that the nun who was his teacher was his biological mother, he had a psychotic episode and murdered his entire adopted family. As an adult he claims that his desire is to kill God, and spends his spare time torturing priests to death.
* In the ''Manga/SoulEater'' manga, [[spoiler:Justin Law]] pulls an ultimate Faith Heel Turn [[spoiler:and kills BJ]] because of imposed insanity from The Clown. [[spoiler: The thing is he doesn't lose his faith. He instead comes to view religion as a form of insanity and therefore converts to the god of insanity.]]
* ''Anime/RurouniKenshin'''s Yukyuzan Anji is a particularly heartbreaking example, though he's not an awful person by any means. He turns from an extremely kind, devout, and physically unimposing [[GoodShepherd Buddhist priest]] to the hulking [[WellIntentionedExtremist fallen priest]] that he is in the Kyoto arc when the children under his care are trapped inside his temple and burned alive, due to the village head hoping to curry favor with the new government and its emperor-centered Shinto.
** Even worse, this is based on actual history, as the Meiji cut off government sponsorship of temples to promote their new standardized form of the "native religion." (The orphans are kinda a stretch, though.)
* Kirei Kotomine of ''LightNovel/FateZero'' had known for many years that he was [[TheSociopath inclined by his nature to evil]] but chose to adhere to the tenants of the Church. Due to the influence of Gilgamesh during the Fourth War he began a descent into villainy, [[LateArrivalSpoiler ending with him laughing happily as he witnessed a fire kill five hundred people]].
* Revy from ''Manga/BlackLagoon'' was quite religious as a child, but stopped believing in God after being [[RapeAsBackstory beaten and sexually-assaulted by a corrupt cop]]. This lead to her becoming a BrokenBird and [[HiredGuns gun-for-hire]] as an adult.

* This is the premise of the motivation for the Joker CaptainErsatz, Mr. Rictus, in ''Comicbook/{{Wanted}}'', a kindly and religious man who was horribly scarred in a fire and, while on the operating table, died but found no afterlife.
* The minor Franchise/MarvelUniverse villain Madcap went there first, save that he also got total immortality and superpowers in the same accident that killed his entire family and church group, making for even greater nihilistic nutsiness (though not nearly as much evil).
* The main character from the title story of WillEisner's ''A Contract With God'' is like this. Having lived his life as a good Jew only to lose his adopted daughter turns him into a slum lord.
** Being Will Eisner, though, he makes it both convincing and tragic.
* At least one ComicBook/{{Chick Tract|s}} does this, possibly a few more. Act surprised. The most perplexing (and [[{{Narm}} unintentionally hilarious]]) example would have to be the one where a child grows up to become evil...because he found out ''there was no Santa Claus''.
* One of the Series/{{Buffy|TheVampireSlayer}} ''Tales of the Vampires'' has a former priest vampire... who is fairly justified about his Faith Heel Turn, all things considered. Reversed in a [[SugarWiki/MomentOfAwesome Crowning Moment Of Awesome]] for a certain {{Cloudcuckoolander}}.
* The book ''Supervillains and Philosophy'' has an essay speculating about Two-Face's philosophical journey. (Obviously, this is a completely non-canon AlternativeCharacterInterpretation.) According to this essay, Harvey Dent aka Comicbook/TwoFace was a believer in the strongly ordered universe of Calvinism when he was a young man. But when he went to college and learned about atheistic philosophies like Existentialism, he began to believe that his two-faced random destruction was more appropriate to the [[StrawNihilist true nature of this chaotic world]].
* In the 1993 Creator/DCComics ''Bloodlines'' crossover, a priest was attacked by one of the alien parasites. He awoke afterwards with a crisis of faith and decay powers, leading to him embracing evil and calling himself Cardinal Sin. Likewise, the man who held a shotgun on the priest was attacked and discovered he now had healing abilities and actually saved the priest before he died, now calling himself Samaritan. Samaritan ended up dying as he managed to cancel out Cardinal Sin's death touch.
* In ''ComicBook/TheKingdom'', Minister William, a future prophet who upheld Superman as divine and above fault, was greatly disillusioned by his "deity's" confession of truth concerning the Kansas disaster that William was rescued from as a boy, that the disaster itself was not Superman's purpose but rather his fault for letting society be protected by [[NinetiesAntiHero the new generation of "heroes"]]. With his faith in Superman shattered, William is soon transformed into Gog and becomes Superman's oppressor.

* In ''Film/BramStokersDracula'' Dracula is originally a very pious nobleman, until one day while he is busy fighting off the enemies of the Church his wife is tricked into thinking he's been killed in battle, and so kills herself in despair. The priest tells him that sorry, suicides are damned for all eternity, nothing to be done about it. Dracula does not take this news at all well, becoming his StartOfDarkness.
* Salieri in ''Film/{{Amadeus}}'' does this after continually being upstaged by the boorish, spoiled, conceited, but vastly more talented Mozart, ultimately deciding to steal his work and drive him to his death, because he couldn't stand that God had made Mozart more gifted than he. Inverted in that even beforehand he was really a JerkAss whose faith in God was basically an extension of his [[EgocentricallyReligious personal vanity]].

* The ''Literature/{{Gone}}'' series: Britney in ''Plague''. Also Astrid, after seriously questioning her faith, becomes much more of an AntiHero.
* ''Literature/TheSparrow'': Emilio Sandoz seems to have this at the beginning of the novel. Much of the book is finding out what exactly happened.
* An inversion, but not a HeelFaithTurn, occurs in ''{{Elantris}}'' with [[spoiler: Hrathen]], whose growing doubts over his religious faith cause him to turn ''against'' the BigBad. From the villain's perspective, this would be a straight example.
* [[spoiler: Hollyleaf]] from ''Literature/WarriorCats'' [[GoMadFromTheRevelation freaks out]] upon learning [[spoiler: her true parentage, promptly switching sides and going on a RoaringRampageOfRevenge.]]
* A Creator/GKChesterton mystery story involves the puzzle of why one person would murder another on the grounds of ideological ''agreement''. In the story, a HollywoodAtheist has been trying to convince a WideEyedIdealist that [[OutgrownSuchSillySuperstitions all morality is merely subjective]]. [[spoiler:He succeeds, so the idealist loses his faith and [[JumpingOffTheSlipperySlope concludes it's not immoral to murder the atheist]], whom he hated. Ergo, their ideological agreement led to murder.]]
* Robert Putney Drake, in Robert Shea and Robert Anton Wilson's ''{{Literature/Illuminatus}}'' trilogy. Born a Boston Brahmin and destined for greatness, he serves in the American Army in UsefulNotes/WW1 and is changed forever by being the last man left alive from his platoon. Returning to the USA, he starts small by heckling street preachers. A combination of survivor guilt and a conviction there is nothing turn him into a ruthless monster.
* ''Literature/TheWheelOfTime'' series has a justified example-general [[TheHedonist hedonist]] and ManipulativeBitch Graendal was once one of the most faithful and diligent aesthetics in the world before her fall...except she was also a complete ControlFreak and egomaniac, who did her turn when she realized she couldn't force the world to be like her. Her new persona is basically a spiteful commentary on her disgust for the world. Justified, of course, in that she fell from grace primarily because of her pride and inability to admit the world had problems she couldn't fix. Losing her faith was just a manifestation of it.

[[folder:Live Action TV]]
* Brother Justin in ''Series/{{Carnivale}}'' starts out as a well-meaning preacher. However, some bad luck, combined with the [[PoisonousFriend influence]] of his [[BrotherSisterIncest loving sister]] ensures he ends up [[TheAntiChrist rather different]]. In his case it was an unfortunate case of InTheBlood, though.
* Averted (or perhaps inverted) with Father Dougal of ''FatherTed''. While Dougal often makes comments which would perfectly fit this kind of character (e.g. something like "Todd, we're not really supposed to believe in that Jesus stuff, are we?"), he is TheDitz and presented as a [[DumbIsGood better person]] than the more faithful Ted.
* ''Series/StarTrekDeepSpaceNine'' has a bit more gradual version: Kai Winn was always jealous of Sisko for being the one the Prophets chose as their Emissary, and the fact that they didn't communicate with her wore on her more and more. Then the Prophets' {{Evil Counterpart}}s, the Pah Wraiths, ''do'' show her some attention, and by this point, that's enough to drive her over the edge to real villainy as their servant, working alongside Gul Dukat.
* An example where the person doesn't turn evil, [[DespairEventHorizon but still gives up on life]], occurs in the ''Series/StarTrekVoyager'' episode "Mortal Coil", where Neelix dies and is brought back to life. He has no memory of experiencing the Talaxian idea of the afterlife (where you go to a forest in which you're reunited with dead loved ones). Because he lost his whole family in a war, that belief was the only thing keeping him going, and it takes Chakotay to talk him out of suicide.
* Ryan Hunter from ''Series/JoanOfArcadia'' apparently suffered one of these (of the SmiteMeOhMightySmiter variety) prior to his first appearance, leading to his becoming a church vandalizing, puppy-kicking anti-theist. Had the show survived for a third season, Ryan would've been Joan's EvilCounterpart.
* An early episode of ''Series/StargateSG1'' had a religious guy go crazy and take over another planet with intense UV radiation as its [[AGodAmI god]]. What's particularly ridiculous about this is that no less than two of his teammates joined him. The one that didn't showed up in later episodes a few times, while the rest all died. Someone really fucked up the selection process for that team.
* Used along with HeelFaithTurn in ''Series/MyNameIsEarl''. A ScaryBlackMan gangster who went by "Hash Brown" and eventually became a priest ends up being on Earl's list at least five times, with each new list item revealed making him angrier and angrier until he snaps and decides to return to his gangster life. Then Earl recognizes his car and reveals that he broke the taillight on it (another list item). The broken taillight caused Hash Brown to get pulled over and be late for a deal which ended up turning into a brutal shootout, meaning that Earl had indirectly saved his life. Since this event was what had caused him to take up religion in the first place (he originally attributed it to divine intervention), he thanks Earl and goes back to being a priest.
* In the ''Series/DoctorWho'' episode "The Unicorn and the Wasp", [[spoiler:the Reverend's homicidal madness came along with a [[OutgrownSuchSillySuperstitions prideful scorn]] for the faith he'd followed all his life]].

[[folder:Professional Wrestling]]
* Given that [[FaceHeelTurn heel turn]] is a wrestling term, examples aren't terribly hard to come by, though it was subverted in Wrestling/{{WWE}} of all promotions where Wrestling/VinceMcMahon grew tired of nice guy Christian Wrestling/ShawnMichaels and decided he wanted the backstabbing playboy Shawn Michaels that nobody liked back. After booking a tag team match with himself and son Wrestling/{{Shane| McMahon}} against Shawn Michaels and God (aka a handicap match) he finally "succeeded". He temporarily got the old Shawn Michaels back, he even got Wrestling/DGenerationX, but Shawn remained a baby {{face}}, [[BeCarefulWhatYouWishFor whose chicanery was now all directed at McMahon]].
* For a straight example, Matt Tremont felt a void in his life, which he thought was caused by his departure from Wrestling/{{CZW}}. Yet even his return didn't do it all for him. Then he saw a light, and a stairway leading up to heaven, where from he saw there was no God, but there was a devil. And that devil's [[PunnyName name]] was Drew Blood! So he joined Drew Blood and the [[PowerStable Forgotten Ones]].[[/folder]]

* OlderThanFeudalism: [[Literature/TheBible The Book of Job]] subverts this trope. {{Satan}} posits that Job is only a good, religious man because he is prosperous, and that if he suffered, would curse God. Satan attempts to test this theory-messengers arrive informing him that all of his livestock were stolen or killed, as well as his servants and children. When that isn't enough, Satan afflicts Job with illness. Job refuses to curse God, despite urging to do so by his wife and his friends-though he does finally break down and ask God "why?" God sharply rebukes Job and his friends, but rewards him for his faith by doubling his family and possessions.

* ''TabletopGame/{{Exalted}}'' has an unusually sympathetic example in the form of the Blood Queen, who used to be one of the Brides of Ahlat, an AmazonBrigade symbolically and literally MarriedToAGod. The Brides of Ahlat are not permitted to sleep with any other man, on pain of death; a little-known fact is that this extends to rape. When the woman who would become the Blood Queen found this out the hard way, she renounced Ahlat, fled Harborhead, and became an akuma in order to take revenge on the entire institution that had ruined her life.

* This is a big part of the [[HistoricalVillainUpgrade presentation]] of Salieri in the play ''Theatre/{{Amadeus}}''. Salieri starts out, as he tells the audience, a pious man living a staid life. His beliefs are called into question when he meets Mozart and doesn't understand why a borderline JerkAss like Mozart gets divine musical talent but he doesn't. Thus, Salieri renounces God, and actually experiences improvement in his status from that point onward.

[[folder:Video Games]]
* ''VideoGame/NeverwinterNights'' features [[spoiler: paladin Aribeth de Tylmarande]], who turns from [[spoiler: Tyr, God of Justice, after her lover Fenthick Moss is unjustly executed for being an UnwittingPawn]]. She then goes on to become commander of the {{BigBad}}'s army. You can choose to try and redeem her towards the end of the game.
* ''VideoGame/GrandiaII'' has [[spoiler: Pope Zera]], who discovers that [[spoiler: God is (literally) dead]] and sets a plan into motion to resurrect the world's equivalent of Satan so he can destroy the world.
* ''VideoGame/VandalHearts II'' has [[spoiler:Yuri]], who was intensely religious throughout all of his childhood and most of his adulthood, until [[spoiler:learning about the deception behind the game's major religion]]. It wasn't enough to turn him into a coldly calculating supervillain from then on or anything, but [[spoiler:it did lead to a HeroicBSOD and eventually made him AxCrazy just long enough to attack the party. Whether you kill him or successfully talk him down depends on whether you have HundredPercentCompletion on the game's hidden plot-relevant treasures and such.]]
* In the ''Franchise/AssassinsCreed'' series, this is pretty much how the Templars fall after learning that [[spoiler:all miracles and works of God were actually the result of powerful ancient technology]].
* [[TheChessmaster Krelian]] and [[BodySurf Grahf]] in ''VideoGame/{{Xenogears}}''. Oh so very much. While [[RageAgainstTheHeavens Raging Against The Heavens]], Krelian claims that, if there is no God, he will ''make'' God with his own hands.
* In ''VideoGame/{{Xenoblade}}'', the goddess [[spoiler:Meyneth]] is a kind and loving deity who just wants to protect life on the two titans [[spoiler:even to the point of pulling a HeroicSacrifice to do so]]. However, because of her desire for peace between the two worlds, her most loyal supporter - Egil - turns on her; believing that his people must take revenge against the Bionis.
* Related to the Dracula example above, ''Franchise/{{Castlevania}}'''s Dracula also renounces God after his wife died while he was busy fighting the crusades, as told by ''VideoGame/CastlevaniaLamentOfInnocence''.
** The ''VideoGame/CastlevaniaLordsOfShadow'' incarnation of Dracula does something similar. A faithful warrior [[spoiler:the protagonist Gabriel Belmont]] devoted to God loses everything and everyone in the course of fulfilling his duty as God's Chosen Champion, and grows increasingly bitter as a result. After being forced to sacrifice his very humanity cleaning up another mess for God, he decides to embrace his role as a GodOfEvil to spite Him. When he is forced into a duel to the death with his own son, that's when he ''really'' snaps and declares open war upon God and all of humanity. The twisted part is that [[spoiler:Gabriel still has God's blessing.]]
* ''VideoGame/DiabloIII'' has Jondar, a former knight who turned necromancer when he discovered [[spoiler:the corruption within his holy order]]. Kormac, in his quest to figure out what it was Jondar discovered, asks the player character to [[spoiler:kill him if he shows any signs of turning bad like Jondar did]].
* In the ''Dawnguard'' DLC of ''VideoGame/TheElderScrollsVSkyrim'', [[spoiler:Arch-Curate Vyrthur of the Chantry of Auri-El (and one of the last of the non-corrupted Falmer[=/=]Snow Elves)]] had been stricken with vampirism, and angrily cast away his faith in the god [[ThePowerOfTheSun Auri-El]] for not intervening to save him. From there, he founded the prophecy to blot out the sun and cast the world in darkness, almost solely as a raised middle finger to Auri-El himself. The only reason he hadn't carried it out sooner is because he needed the blood of a pure-blooded vampire (or, to put it another way, [[spoiler:a Daughter of Coldharbour, like Serana]]) to act on it.
* Deconstructed with ''VideoGame/DragonAgeInquisition''. [[spoiler:[[HumanoidAbomination Corypheus the Elder One]] was motivated into [[AGodAmI attempting to become a god]] by merging [[SpiritWorld the Fade]] with Thedas after he realized his own god, Dumat, was killed by mortals and that there was no trace of [[CrystalDragonJesus the Maker]] in the Black City. ''Before'' he visited the Black City and lost his faith, he was an EvilSorcerer likely responsible for corrupting it in the first place (which is said to have been what caused the Maker to abandon it). In effect, his loss of faith didn't actually change his ideology at all, he just thinks he needs to replace Dumat to give meaning to the world.]]

[[folder:Web Comics]]
* Subverted in ''WebComic/{{Homestuck}}'': The complete and utter deconstruction of his religion was one of the several factors resulting in [[spoiler:Gamzee Makara's insanity-induced killing spree]], but [[spoiler:he goes back to his faith afterwards and remains every bit as evil.]]

* A lot of Website/FundiesSayTheDarndestThings quotes feature people who fear having a crisis of faith because they believe this will happen.

[[folder:Western Animation]]
* Several examples from ''WesternAnimation/DrawnTogether'':
** In the two-part episode "Lost in Parking Space", the devoutly religious Princess Clara is led to believe that the Rapture has come and taken her friends but left her behind on Earth. After she signs her soul away to a man she believes is Satan, she decides that she enjoys being evil and promptly goes on a rampage. When she discovers that the Rapture didn't actually come (her friends just ditched her to go to the mall), she changes back.
** Bob the Cucumber in "Clum Babies" goes on a murderous rampage and kills the entire cast when he is told that the Bible is open to interpretation.
* [[PlayingWithATrope Played with]] on ''WesternAnimation/TheSimpsons'' when [[PalsWithJesus Ned Flanders]] loses faith after his wife dies, turning the picture of God away from him and scaring his kids with his decision not to go to church.
-->'''Ned''': No, I'm not kidding. I'm going to sit right here and miss church. You just watch. (SmashCut to Ned driving his car and looking Heavenward) Sorry, sorry, sorry, sorry, sorry!
** It's more a parody on the Book of Job than Ned fully losing his faith. He recovers completely over the course of the episode.
** {{Lampshade|Hanging}}d in "Lemon of Troy" when Bart is handing out roles to the members of his team. He designates Todd Flanders "the quiet religious guy who ends up going crazy".
* In ''WesternAnimation/AmericanDad'', one episode has the rapture happen. Stan is completely bewildered that he had been left behind and tries desperately to get into Heaven, including trying to convince (fake) Jesus Christ that he is more worthy to be sent to Heaven than his wife, Francine. Francine is naturally ticked off by Stan's behavior and she abandons him, but she runs into the real Jesus and she rubs it in to Stan before she is whisked away by Jesus. Cut to 7 years later when the war between Heaven and Hell breaks out on Earth where Stan is now a hardened and scarred hunter who has denounced Jesus and God because despite doing what he thinks was being a good Christian, he was still left behind. Stan's faith is slowly restored though once he learns from Jesus that Francine was captured by the Anti-Christ and he vows to save her after Jesus promises Stan entry to Heaven.