Of course evil exists, but it need not be supernatural. I am personally skeptical of anything supernatural, even though I experience deja vu every now and then.
So, label me a skeptic on things like demonic possession, ghosts, UFO, vampires, Bigfoot, etc.....until I see them with my own eyes.
I certainly understand your point of view.
Physiological disorders have existed since time began.
I believe demonic/evil spirits are the disembodied spirits of Nephilim.
Being demon possessed is straight out of the Bible. It is nothing new. If you don’t believe the Bible, that is another thing.
Do you want to see a person who is probably demon possessed? Check this infamous video out. This is former Obama Aide, Anita Dunn praising Mao Tse Tung. Notice the tongue flapping? No mystery to me on what is happening here.
Matthew 8:28-34 says, “When he arrived at the other side in the region of the Gadarenes, two demon-possessed men coming from the tombs met him. They were so violent that no one could pass that way. ‘What do you want with us, Son of God?’ they shouted. ‘Have you come here to torture us before the appointed time?’ Some distance from them a large herd of pigs was feeding. The demons begged Jesus, ‘If you drive us out, send us into the herd of pigs.’ He said to them, ‘Go!’ So they came out and went into the pigs, and the whole herd rushed down the steep bank into the lake and died in the water. Those tending the pigs ran off, went into the town and reported all this, including what had happened to the demon-possessed men. Then the whole town went out to meet Jesus. And when they saw him, they pleaded with him to leave their region.”