Logic of being atheist in a default D&D campaign.

[Umbran]

They can't make planes, create worlds, light stars, sink nations, make races, print souls, etc, etc.

There have been epic level magics for PCs in some editions that involve creating planes, if I recall correctly.

As for the rest - depending on the edition and rules you're talking about, D&D gods can't do those things either.

 

[tomBitonti]

Maybe, you don't justify it? The default setting (except Eberron) has deities written into the rules. Any character who doesn't believe deities exist (without quibbling over the definition) has a gross disassociation. That is, they are insane. Most other characters would treat with them as we would treat someone who disbelieved a plainly visible truth.

Eberron is a special case, in that divine power exists, but deities as such do not provably exist. You could get away with it in Midnight, too.

Thx!

TomB