I may be mistaken but I thought that I had read some where that a few would be abducties who use the in the Name of Jesus I rebuke thee or something of that effect were not abducted. And from what I have read that those seeking that sort of contact and open themselves up to it begin to interact with unknown entities. I do not think that they are from another galaxies that is part of the delusion.I personally believe that they are demonic.
I certainly believe they are in cahoots with satan
WHATEVER they are.
Guy Malone, IIRC, believes that they are fallen angels, nephilium, watchers and not demons—at least not most of them.
IIRC, he defines demons as disembodied such that were killed in Noah’s flood.
Some do contend that the greys—at least some of the greys—are bioengineered bodies that demons can inhabit . . . and that live for a year or so.