While I would like to believe in angels, but do not, I do not believe in demons either. I believe there is a supernatural, but like it’s description, it’s unknown...as God wants it to be. I know throughout history, many people have wanted to and have said they did or do know the supernatural. I don’t believe them. It’s just one of those things that cannot be satisfactorily proven to any real number of people over time.
What you are saying is that you do not accept the Bible's terms for supernatural beings.
angels; archangels; cherubim; seraphim;
unclean spirits; devils; the devil/Satan
Have you considered how prophesy proves the Truth of it?