I'm about to get laughed at, but...
Demons. :) (Fallen angels, celestial entities, whatever you prefer).
I mean, if you're the type of person who takes the Bible literally (when it's meant to be literal), then acknowledging the reality of demons isn't a leap. They were cast down and occupy our realm... they're technically extraterrestrial, and arguably they operate with advanced knowledge from what we mere mortals possess.
Okay... stop laughing, but... there it is.
Your view (and variations of it) are shared by many in the UFO field.
That group includes Jacques Vallee and Laura Knight-Jadczyk.
Their books on the topic:
https://www.amazon.com/Passport-Magonia-Folklore-Parallel-Worlds/dp/0809237962
“Okay... stop laughing, but... there it is.”
No laughing here...I think that’s actually the “silent majority” view among ordinary Christians, including my wife and I (Catholics).
Demons are evidently fallen angels who lost their bodies in Noah’s flood.
There’s plenty still around who did not lose their bodies.
EXO-VATICANA is the best source we know of on the topic. Also, L.A. Marzulli has done excellent work in the field and is also a very authentic Christian. He gave an excellent presentation at a Native American church not far from our household.