> We don't think that people who think there's a bearded man in heaven are crazy, even if that's crazier than thinking earth is flat.

Um speak for yourself.

I think most of us atheists do think that but we're too polite to not say it. Besides, it won't change anything so there's no point.

Equating flat earthism with religion is just ignorant. They are not epistemologically equivalent. Normalizing flat earth beliefs like this is actively harmful.