The argument from reasonable nonbelief- If the existence of the gods were self-evident, everyone would believe. The burden of proof is on religion. Russell's teapot is a classic example of a proposition that we do not take on faith.
The argument from inconsistent revelations- Sectarian religions are mutually contradictory, internally inconsistent an incoherent. They can't all be right, so who's to say they're not all wrong? Madalyn Murray O-Hair understood that no interpretation could salvage supernatural revelation.
The argument from evil- If the gods are real, they have a lot of explaining to do. Carl Sagan celebrated the world on its own terms, not as capricious deities would have it.