Gods tend to be extremely powerful. Many are said to be strong enough to create and/or destroy entire universes with a single thought.
That is...when they do think. In the world of fiction, there are just as many gods that are extremely dim-witted as there are gods that are very wise. These gods are so dense that they are either completely incompetent with their abilities or they utterly forget that they even have divine powers at all.
See also God Is Flawed for when deities are imperfect for other reasons, and Mad God for deities that are depicted as being insane. Compare God Is Inept for when deities are not good at their job regardless of how intelligent they may be. Do note that an Almighty Idiot isn't always necessarily a god.
- Azathoth from various H. P. Lovecraft stories is known as the "Blind Idiot God". He's so powerful that he can destroy the universe with a single thought. Luckily for us, he's incredibly stupid and has very few, if any, thoughts.
- The god in the first of John Brunner's The Traveller in Black stories is basically a big powerful child.
- Thor from The Hitch Hikers Guide To The Galaxy.
- David Eddings' The Elenium/The Tamuli universe:
Sephrenia: Khwaj will understand your thoughts. Pray that you never understand his.
- One of the thousand Styric gods is this, needing things explained to him repeatedly in words of few syllables.
- The Troll Gods are not very clever, but they are cunning, ruthless and extremely powerful, and what they're asked to do never seriously tests the limits of their understanding.
- They are extremely specialized, however, and have a very hard time understanding things outside of their specialties (the concept of "hostage", for example).
- Several of the gods in the Discworld. Small Gods notes the peculiar circumstance of men and women of immense strength and virtue devoting themselves to the service of completely stupid gods.
- Occurs in the Gilligan's Island pinball, as one of the random rewards a player can get is "Gift of Gods", which gives the other players 1 million points each.
- In Werewolf: The Apocalypse, the members of the Triat are extremely powerful but seem to lack common sense. The Weaver decided that it would be a good idea to bind the Wyrm in the web of creation, then ignored the huge problems this created for Gaia. The Wyrm has been bound in the Weaver's web for eons but can't seem to extract himself from it, despite being a powerful Eldritch Abomination. The Wyld has been standing by while all of this has been going on, too stupid or apathetic to do anything about it. Even the Corax tribebook speculates that the Wyld was off "picking his toes" during the primordial incident with the Weaver and Wyrm.
- Some sourcebooks imply that the Wyld lacks any consciousness, even a stupid one.
- At the end of EarthBound, Giygas' quest for power is revealed to have destroyed his mind, prompting Pokey Minch to refer to him as an "Almighty Idiot" before bailing on him.
- While the goddesses of the Neptunia worlds are mostly sensible and capable of solid thinking, it doesn't change the fact that a number of plot points happen because they act like dunderheads. The best example of this is Peashy, who was ascended to godhood as a child and thus is very underdeveloped intelligently for someone of that position.