Yosharian
Arcane
Ehhh not reallyGods of W40K, at least judging from the little I know, don't seem to be neither omnipotent, omniscient and neither immortal. So very powerful entities but not gods in a classic way. Worshipping them as such is more than a political stance than faith.
Chaos seems to be kind of like a primordial force that's created from all the evil in the universe
Like for example the degeneracy of the Eldar, pre-fall, birthed Slaanesh
Other gods I'm not sure
But worshipping them is definitely still a matter of faith in most cases