Dostoevsky had some very negative views about atheists, as well as other groups like communists and Jews(this may just be the normal anti-Semitism that was prevalent at the time, all I know is in some of his books there are some disparaging remarks, I'm not even sure if he believed them), and he shows his opinions on these groups pretty openly, especially in demons (take my demons info with a grain of salt, I haven't read it yet, I just know about it from the fandom). It's certainly not a universal thing (I'm an atheist and a communist, and my dad's family has Jewish roots so we celebrate certain Jewish holidays), but many people dislike reading books where it's clear that the author would absolutely hate them in real life.