Second, the bible reveals knowledge about a lot of imaginary beings. It would sound rather disrespectful to note that DC Comics reveal a lot about Superman but no different principle is involved.
So it's a matter of knowing when to bother and when not to bother. If imaginary beings are causing the subject emotional or mental problems, such as anxiety or paranoia, then it's time to seek trained medical help, you'd surely agree.
I've read parts of the bible carefully, but I won't bother revisiting the parts about demons, because I see no point.
(As you know, both in comedies and in horror stories, at this point the demon fans rush forward and say, "AAGH! Demons are making you say that!!!! We must help you!!!" And that lovely one, "AAGH! Only those possessed by demons deny the reality of demons!!!! You ARE possessed!" But of course the demons they speak of exist only as things imagined in their brains, poor folks.)