I know these people who actually see demons perching on their foot boards and chests of drawers as they goto sleep. They have meaningful interactions with these things. They then take their anti-psychotic medicine and their brain is altered such that they can no longer see these things.
For all of human history, we had no idea about the nature of schizophrenia. We had no idea about many facts of nature. For virtually all of recorded history except the last 200 years or so, we had no idea that this might be a phenomena internal to the human's mind.
This is just one thing about the nature of reality that we were very ignorant about. And we wrote stories and developed systems to try to comprehend things that scared us during the dark nights where only a little candle light would shine.
And when the realization of the wild behaviors of the brain came within the realm of human understanding, people still want to give value to the things that minds thought up and formed to match their reality.
For all of human history, people would see demons and spirits just as john nash did in that recent movie "a beautiful mind." People interacted with components of their psyche in a wild way disconnected from the confines of physical reality... They can do this because, just like in a modern computer, the world that is experienced is ONLY a representation.
Knowing what we know about the human brain and the things it is capable of and persisting with the notion that things like djinn and ghosts exist is to profess ignorance on the topic. You're better off remaining quiet.
