God

God may variously refer to the creator of our universe, the most powerful being in existence, the only person allowed to dictate morals, the guy who's pulling the strings, an old dude with a long beard wearing a toga, three persons that are one, the nice guy who's up there somewhere, some incorporeal entity which may or may not be sentient, or any random combination of these.

He may or may not be out there, but while some people feel they can't live meaningful lives without him, others believe they need to insist he doesn't exist in order to be considered smart.