Speaking as the founder of the "we hate the supernatural" religion (that's not quite what it believed, but close enough that I won't quibble) members of the religion believed in several gods. They just thought the gods hated them, and the feeling was mutual.
Very true, the gods were real, we just weren't all that sure they liked us/cared about us or that there was anything gained from Worshipping them. There was even a secret sect that was attempting to create a human god to protect them from the whims of the others.
