The Book of Revelation deserves its own entry. What it contains includes, but is not limited to: demonic locusts with scorpion stingers, an army of 200 million horsemen that wipes out a third of mankind, seas turning to blood, creatures covered with eyes, and a meteor (shooting star) falling on the rivers of the earth making the water poisonous. Jesus is described as a lamb that has a slit throat and multiple eyes.
The horrifying image of the moon being covered with blood.
If it helps, it could just be a reference to a lunar eclipse, which makes the moon appear blood red. Since the moon turning blood red is another account of the moon not giving its light, and this prophecy is placed in proximity with the sun being darkened, it's reasonable to figure that eclipses will be among the signs that herald the Second Coming.
When there's a lot of smoke in the air (as in a forest fire) the moon and sun turn dark red. Maybe this image refers to a terrible war; as a city burns, the air is full of smoke.
Satan's form during this time will be a dragon large enough to sweep one third of the stars from the sky with a flick of his tail.
Then there's Satanhimself. Imagine: an incredibly evil being who hates everybody and everything and wants nothing but to see you suffer and he appears... As the most beautiful of all angels, so wonderful-looking you couldn't not worship him if you saw him. Faux Affably Evil at its best/worst.
He's basically the founder of Nightmare Fuel; it exists because of him.
Well, The Bible never says that you couldn't help but worship Satan if you saw him. That's just purely a man-made theory. Still scary as hell though.
And why does he hate everybody? He simply can't stand anything that reminds him of God, or His creations. All his animosity is derived from nothing but spite and pride.
God could sentence you to death in a heartbeat purely to get some other fellow to make up his mind. Are you the oldest child by any chance?
Arguably worse is the strict rules he enforced the Israelites to carry out. I sure hope you aren't inclined towards sassing back at your parents...
And God knows everything, so He knew when He created you whether or not you would break those rules. Even if he knew you would fail and be damned for all eternity, he still made you, just to be condemned to hell. God creates people entirely to deem them unworthy and sentence them to eternal, unimaginable suffering.
God is portrayed as literally omnipotent and still allows people to suffer forever. It's not even as if it's doing any good that God couldn't already do with his omnipotence.
Though there's still the issue of free will, as The Bible explicitly says that God does not tempt man to do evil and that the plans he has for us are good( James 1:13, Jeremiah 29:11)
The death of Jezebel also deserves a special mention for sheer graphic description and squickiness. First, thrown out a window, then run over by a chariot, and then eaten by dogs. Yikes. (This is, however, a Karmic Death. Jezebel was responsible for the introduction of that particular wave of Baal worship into Israel. Although there are a few quibbles about whether they are the same, Baal was sometimes called Molech, and a part of the worship of Molech may have involved the sacrifice of children by burning them alive.)
There is much controversy over who or what Moloch was, with only a handful of references in the Bible and no archaeological evidence otherwise.
The Flood, anyone? Once you get past all of the animals that Noah saved, EVERYBODY AND EVERYTHING ON EARTH died. All of the animals that weren't in the ark drowned. Everyone that Noah knew (save his immediate family) drowned. After they got off the ark, they were ENTIRELY ALONE IN THE WORLD.
Not to mention the smell. Forty days and forty nights (maybe more considering how long it might have dissipated.) of every living thing rotting in the ocean.
A Shel Silverstein poem explains that the unicorns were too busy playing to get on the arknote sotto voce: idiots and they all drowned. There's rats and cats and elephants, but as sure as you're born, you're never gonna see no unicorn.
If it makes you feel any better, there are stories where the unicorns became narwhals instead of drowning.
Another possibility is that Noah did take a couple of unicorns on board. He just Failed a Spot Check and didn't realize that they were both male.
The creation of the rainbow deserves mention as well. After having wiped out the overwhelming majority of the human and animal population, God places the rainbow in the sky every time it rains—a covenant, in a sense, that he will never do such a thing again, but also a reminder that God is perfectly capable of destroying the world and he's done it before. Even better if you take the interpretation by a certain gospel song: "God sent Noah the rainbow sign: / No more water—the fire next time!"
Let us not get started on what the angels look like.
Subverted in that they're on your side... if you're smart enough to not turn against the most powerful being in the universe that is.
Come on, we've got to mention the classic I-was-scarred-by-CCD example: Abraham being told to sacrifice Isaac. NOT COOL, GOD!
Read Larry Gonick's History of the World, The Isaac thing was a bluff to get him to behave.
There is a short story/religious commentary about Rebecca's marriage to Isaac that explores the psychological scarring that near-sacrifice has on Isaac. (I.e., depression, trust issues, and nightmares where his father is still binding him to the sacrificial altar!) Worse yet, Rebecca fears that God will ask the same of Isaac himself—and that this time, he may not send a last-minute substitute.
Acts 11:7. "And I heard a voice saying unto me, Arise, Peter; slay and eat." Imagine it being said in the G-Man's voice.
Now Cain said to his brother Abel, "Let's go out to the field." And while they were in the field, Cain attacked his brother Abel and killed him. Then the LORD said to Cain, "Where is your brother Abel?" "I don't know," he replied. "Am I my brother's keeper?" The LORD said, "What have you done? Listen! Your brother's blood cries out to me from the ground."
God himself. Hollywood Atheists say, "How can we believe in something we can't see?". Anyone who's read the Bible will tell you that merely looking upon God in our current mortal state is an instant death spell. That's actually a bit comforting, in retrospect, that we can't see God, cause otherwise we'd constantly be blowing up.
Fridge Brilliance: God used to walk freely with Adam but as sin corrupted man, but man can no longer do that because God's presence kills sin.
Ezekiel 4:12. It's about baking bread using human excrement as fuel to the fire. That's all I have to say. Om nom nom.
Actually, cattle dung is a pretty handy fuel. More like Squick than HONF.
The AntiChrist. Now, as a Christian, I realize that ANYBODY can be anti-Christian, and the Anti Christ in The Revelation is more-or-less The Beast. However, the Anti Christ is just plain scary. Watching the Anti Christ discussion on the History Channel, they point out that people throughout history have been called the Son of the Devil. Nero, Napoleon... even Hitler! Given the fact that (although YMMV on Napoleon) those previous guys were all pretty frickin' awful, just imagine how horrible the true blue SOTD will be.
Word of Dante is in play there. Before being imagined as a single person, it pretty much just meant anyone who didn't believe in the Christian God.
Hell. In these days it's usually Flanderized into a caricature with pitchfork-wielding horned demons, but a number of horrifying interpretations have been extracted from the Bible's brief and cryptic descriptionnote ("outer darkness" where the people are, "lake of fire..." "...for the devil and his angels"). You're conscious, but as an immobile, rotting corpse, blind and helpless in the empty darkness of a void deeper than space. You can't hear anything; you can't see anything. You're all alone. All you can do is cry weakly from hunger, thirst, pain, and loneliness. Worms burrow through your flesh; you can sense them chewing at your bones, gnawing them down incrementally. And of course, all the while your blind eyes and nostrils are burning with fire and sulfuric acid. It goes on FOREVER. Jesus said even the Too Kinky to Torture wouldn't be able to handle it.
The thing that is truly terrifying about Hell is that the demons will torment you physically and verbally; you'll be reminded of your sins and that you had time to repent in your life but didn't. And no matter what you do you can't get out. Numerous depictions of Christianity state that even the demons are being subjected to the terrors of Hell. Why do you think Satan is out in the world (such as being in the desert with Jesus) tempting people instead of working from Hell? Because not even the dragon capable of flinging a third of the stars with its tail wants to be in Hell.
One interpretation is that Hell is just a state of shame and separation from God. Though, eternal boredom wouldn't be much fun (who wants to live forever?) Less scary than eternal torture?
Even that interpretation lends itself to some less than appealing psychological trauma. Shame and guilt can be very damaging to people, so imagine what an eternity of it can do to you. Or that you are confronted with Heaven and God and perfect love and happiness are real and knowing that you're never, ever, EVER going to experience it and it's your own fault.
The Beast of Revelation, the Four Horsemen of the Apocalypse.
The death of the firstborns in Exodus. All these Egyptian children are completely innocent for the plight of the Jewish slaves, yet they are all killed by the angel of death (which deserves a mention itself).
Note that the way God hardened the Pharaoh's heart (so he wouldn't free the slaves) is a point of contention: many scholars believe it should be translated as "The Thought of God hardened his heart". Still scary.
The plagues are all nightmare fuel. River of blood? Swarms of insects? Hail fire? Gazillions of flies filling the air. Brrr.
On the bright side, the fire would have got rid of the flies.
According to Revelation, Satan does not rule Hell but one day he will be imprisoned there forever and ever. Right now, he is here on Earth... walking amongst us.
Stay alert! For your great enemy prowls around like a roaring lion, looking for whom he may devour.
Every religion (see Folklore/Urban Myths) has this in one way or the other, though some "dark gods" can be quite sympathetic. Hindus have Kali and Shiva, gods of death and destruction. Greco-Roman people have Cronos, who ate his own sons, and Hades, lord of the underworld and death. Mayans and Aztecs have the whole "human sacrifice" thing. Africans have Anansi the Spider.
Sodom and Gomorrah. Theories about why they attracted God's wrath run the spectrum from "failure to show proper hospitality to strangers" to "attempted violent assault and gang-rape of strangers", but either way, it got nuked. With fire and brimstone. The only survivors were Lot and his daughters - his wife dared to look back and got turned into a pillar of salt for it. There are other times God smote his enemies, but this one wins out for sheer obliteration. Not to mention that the two angels come to the city to see how good people were, and all the guys lusted after them. The angels then went to the Lot's house, where because of aforementioned lust for the angels, they asked for them so that they could have fun. Lot refuses, and instead offers them his virgin daughters.
Worse still is when they escape and later live in a cave in the mountains that Lot's daughters get him drunk and have sex with him. Let me say that again: Lot is date rapedby his own daughters.
Although, you have to read this in context: This was not long after the Earth was created and there were not a lot of people on the Earth to mate with. Cain, for instance, had to have had a sister with whom he had relations with as The Bible says he did indeed have a son and there were no humans on the Earth aside from him and his siblings and parents. So such a disturbing case wouldn't have been nearly as dangerous back then as it is now. Still.... it gives you a better feeling about living in todays era, what with all the madness going on in the Bible times that isn't repeated today.
He's some more Fridge Horror involving these cities, Jesus said that in final day of Judgement it is much more bearable in Sodom than in cities that he went through and failed to repent. While the city is corrupt his works would bring even that city to its knees in forgiveness. O_O
The sheer torture that Jesus had to undergo before dying can make anyone shudder.
What makes it worse? He knew not everyone would believe him, or that he existed at all. So, unless Inclusivism or Universalism are true....
The "Agony in the Garden" incident makes the crucifixion even worse. It would be alright if Jesus was portrayed as an invulnerable divine superhuman (as some Gnostic sects do, having him switch himself out with a fake image of himself and laughing at his executioners), but this scene shows that, whatever his godly status, Jesus is a fully human man who knows exactly what's about to happen to him and is terrified of the agony he'll have to go through for people who largely despise him. He all but begs God to find some way around the plan set for him.