Atheism, nothing. Atheists, quite a bit. Some of them tend to lump all religions, not just majority ones, together and assume there’s something cult like about them. Weirdly enough, most are okay with mainstream religions, but get scared when they find out someone practices magick of which they don’t believe in.
Regarding science, they treat it like Christians treat the bible. As if science is this set concept that never changes. They know how reality works because science tells them. No, that’s not how it works. Science explores possibilities of the unknown and things we do not understand. How hard is that to get? And in fact, many of the things science discovers, ancient societies and magicians already knew. Atheists act like science knows everything because earlier cultures were stupid and superstitious.
Not to mention, even if atheists don’t believe in the Christian god, they still have a watered down Christian dominated mentality. They don’t even challenge it. Many still have aversions towards sex and lgbt. They can still get scared by witches and warlocks. They still can be prejudice towards people they don’t understand. They can still be swayed by cuddly images. And they can still have this traditionalist mentality. Yes, not all athiests are like that, but many still are.