It is important to distinguish people who are atheist because they do not believe in God and those who are atheist because they want to feel smart
this distinction I believe exists even among believers, I have met and talked to a few believers who displayed extremely annoying holier-than-thou behaviour because I don't believe in God

I was atheist once and nearly became one of those fedora tipping retards, thankfully I slowly came to realize how shitty some behaviour was, the last straw was a few people posting a picture with the caption "waiting outside the church so we can laugh at the idiots going in", why would anyone be such an asshole to people they probably don't even know?
Anyway, back on topic, imo the people who use their lack of belief as a way to feel smart may still be insecure deep inside, when faced with the unknowns of life man needs some support, whether it be from a loli lover, family or God, but perhaps they are too ashamed of going back to the religion they spat on so much so they seek out other more esoteric religions