[Hebrews 11:6]

Sorry that I was unclear. Jude 6’s reference is usually thought to be to the fallen angels who left their boundaries and impregnated humans. As interim punishment God has kept them bound in the dark abyss, which the demons of Luke 8:31 greatly fear. All other demons roam freely.

[RoosterRedux]

I am doing a re-read (3rd or 4th time) of Michael Heiser's Unseen Realms and would have to say that I don't know if there is an identifying Biblical difference between demons, fallen angels (in general, other than those in Gen 6), evil angelic beings, "other" or "foreign" gods, etc.

There's a lot to the subject particularly when one includes what is in the Mesopotamian, Akkadian, Sumerian, Assyrian, Babylonian, etc. literature in such an analysis.

There's a whole lot more to the story than is presented in Church and most pastors won't touch this stuff with a ten foot pole.;-)

BTW, I highly recommend "Unseen Realms" if you haven't read it...though I don't necessarily agree with everything he posits. Check out the reviews at source above if you are unfamiliar with it. Very good for in context Old Testament study.