The religion devoted to one's own smug sense of superiority.
As there is no way to use logic to prove or disprove the existence of God, atheism is, in fact, based completely on theory and faith. Also its followers tend to be no less educated, dogmatic, and fanatical about their chosen spiritual path than they claim Christians, Jews, or Muslims to be.
Word used by white supremacists to explain their belief that the Holocaust never happened, that Hitler and the Nazis "weren't that bad," and was all a ploy by the West to give Jews their own land or money, or something...I'm honestly not sure, their reasoning is just too stupid.
White supremacist reasoning: "So the Holocaust was really messed up and there's no logical way to justify it, so what we'll do is pretend it never happened. That way we can appeal to the gullible and the stupid among us, God knows there's lots of them. And we can even have a clever name for it: Holohoax! We're so smart..."