I believe that demons are fictional entities invented by humans rather than real entities that exist outside of the human mind.
Are we getting back to the supernatural is not real because it can not be known. And if it could be known then science could study it.
But then......it would not be super natural any more.
Bahhhahhhaawwaaa hahaha ha!!!!
What if the man on the street says a demon is as a demon does?
Oh wait.... I got it, demons exist to those who believe in them. However, they are products of the human mind and exist as fiction. But for the average man on the street describing a demon he may not be able to distinguish a super natural demon from a natural one.
So a crazy person acting like a demon is really just a crazy person acting like a demon. Unless one believes that a demon acts like a crazy person who is possessed. But the moment one cast a doubt as to the supernatural evil spirit demon, then it is merely a matter of doubt rather than some empirical evidence that the person who is acting like a demon is not infact a demon.
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"You were not there for the beginning. You will not be there for the end. Your knowledge of what is going on can only be superficial and relative" William S. Burroughs