are you an atheist?

this feels more like "my atheism is more pure than your atheism", which doesn't make me feel comfortable

you could try starting a hashtag #notallcishetwhitemaleatheists, but somehow I don't think it would sit well.

it's probably simplest to try to quiet your discomfort by telling yourself the chance is quite high that they will simply do that 'human thing' of holding two contradictory ideas at the same time, and what is absolutely true for them in one frame of mind will be replaced by a different, more flexible, truth at other times.