I agree completely that they are not aliens, and that they may very well be related in some way to fallen angels, i.e. demons. My guess at the most likely explanation is that they are phenomena generated by demonic entities that will at some point be used to deceive mankind about his own origin. They may very well claim to be aliens who seeded us here, and will likely also claim that there is no god, only them. Just my theory.
J. Allen Hynek, in his book “UFOs - A Scientific Inquiry”, said that after years of researching the topic he was reaching the conclusion that the phenomenon appears more paranormal or spiritual, rather than strictly physical. He noted the similarities between UFO close encounters and ghost or poltergeist phenomena - beings walking through walls, contacting people psychically, even dictating messages to them through “automatic writing”, etc.
One way or another there’s something very strange going on here.
This is too difficult for the non-Bible-believing materialist, but this is the position we take.