Why do millions of American Christians believe the ridiculous Bible stories even though this is the 21st century and not the Dark Ages?

I know they're uneducated. I know they're brainwashed. I know they have a childish cowardly fear of the disgusting insane magical hell fantasy. I know they're not too bright.

But still, how is it possible they are able to believe the entire insane Bible? They even believe the totally ridiculous Noah's Ark genocide myth even though I used to think it was impossible for anyone to grow up and still believe it.

Apparently Christians are the most retarded fucked up idiots in all of human history.