Demons don’t have bodies.
Correct, Roving.
Jesus’ interaction with the demons shows us that demons need a body to inhabit. Angels on the other hand, can appear in a body.
It is supposed, and I have no good argument against it, that the demons are the spirits of the deceased funky lil children of the fallen angels.
They don’t have frail and mortal bodies, like we do.
It doesn’t mean they cannot assume physical form or have a phsyical form that we do not understand.