Totally get that. Metropolitan areas are usually less hung up about that. But most of America is not metropolitan, in fact, they shun "big city" ideas. These days, even the suburban areas are highly religious and open to "demons" interfering in their lives.
Just thinking aloud here and might be totally inacurate...
But I, and I'm not there, am not sure how much this focus on "demons" is a result of Christianity's influence.
I'm not sure how much these "demons" are related to the Christian faith.
For me, and this is personal opinion, they seem to be much more based in the very American and very popular internet/Creepy Pasta/Reddit influence on talking about paranormal phenomena...all seems very shallow and designed to thrill and delight (which is not a bad thing) rather than actually be thoughtful about this stuff...
Black eyed children
American contemporary legends. Very much disseminated via the internet.
(Before anyone says that demons are hardly contemporary, obviously I know that...what am I trying to say? I don't feel these "demons" are anything to do with Biblical demons.)