Atheism is a conclusion, not a belief. It's not a religion, we don't have an "Atheist bible" though really stupid religious people seem to think we do, also claiming to have read "the atheist bible" lmfao REALLY stupid people!
Atheism, Religion, God is Imaginary. All religion is manmade. If one god made it up all by himself, then there would be no diversity in religion because all religious texts would have come fro the same source.