I have never, not one time here on fedi, gotten a post across my feed that told me I was stupid or even misguided for not being of a particular religion. It hasn't happened even one time and I looked up hashtags, I follow some Christians apparently. Some Muslims too. Probably other believers I'm sure, and atheists as well.
I have gotten hundreds of posts on my feed saying basically that, just, because I'm not an atheist. They direct their vitriol to anyone who isn't an atheist simply in the words they choose. Look at this very thread for a clear example, go all the way back to the top.
To be fair, most of them came from this one user, they're a particularly immature person. But certainly not all of em.
Just compare hashtags. #Christian vs #atheism vs whatever else you choose. There's ten times as much atheist chatter than there is Christian chatter.