[quote=Omega]
You would be running around with guys gaining power from dark gods. You can be an atheist all you want in this universe but the gods know you exist and you are hanging out with guys who they are directing. Things are unlikely to go well for you.
[/quote]

Atheist doesn't mean denying existence of uber powers, but the character wouldn't see them as gods, just very powerful beings. Insofar as my knowledge of Chaos Gods, that is not a problem for the most part as long as they are recognized.