Demons might exist. We don't know. Also, if demons exist, then perhaps the Bible is actually accurate, in which case space really is fake and gay. Shrug.
The possibility that there is an entity that is "extraterrestrial" that is so powerful/complex/confounding that our brains cannot understand it is very real. Conversely, one could go read Ezekiel 10:1-22 and conclude that he's talking about aliens and space ships. Whassa difference between an angel and an astronaut from Orion's Belt? Dunno. ... Maybe nothing. Maybe the Angels are the Archons and the Archons are the Annunaki troops and it's all real. I have no idea.
"Any sufficiently advanced technology is indistinguishable from magic." - A.C. Clarke.
I should also address the "demons" comment.
"Any sufficiently advanced technology is indistinguishable from magic." - A.C. Clarke.