You’ve watched to many movies, they’re so disturbing to watch and also what evil can do. These movies often over emphasize evil and how powerful it is, making it sound as though nothing can overcome its wickedness. They are making money off of fear.
You are actually writing about two different things, “but it is the unsaved” and “those who are perishing fall backward in scriptures” - which an unsaved person, was never really saved to begin with and the one who was saved fell back into their own sins. When Jesus spoke about sin - he added this thought, " 21 When a strong man, fully armed, guards his own house, his possessions are safe. 22 But when someone stronger attacks and overpowers him, he takes away the armor in which the man trusted and divides up his plunder."
The wording in this passage tells us that the man who was strong - but, on his own accord, wasn’t able to withstand his opponent - or their adversary, the same thing can be applied to individual nations, as “Slain in the Spirit” can be toward a people, for their sins. However, possession - is difficult to understand. The question being, a wicked or evil person can do harm to others, some are in power as leaders and then there are individual persons (in the bible) that we read, that take in a evil spirit - both types do harm. What makes these types of evil different from each other - as evil can possess and empower an individual on different levels (like Eve - “your eyes will be opened, and you will be like God, knowing good and evil.”) - we know Pharaoh,and using a scriptural figure, was used to show God’s glory by refusing to let the Israelite go. We then read from the New Testament about an evil spirit that comes out of a man, it goes through arid places seeking rest and does not find it - "Then it says, “I will return to the house I left.” When it arrives, it finds the house swept clean and put in order. So what does it mean by, the house was swept clean and put in order? Does it mean that someone “cleaned” up their own house without the assistance of the God - they stopped sinning? and that they put their life back in order? (the unsaved person?)
“Then it goes and takes seven other spirits more wicked than itself, and they go in and live there. And the final condition of that man is worse than the first.” (does that mean possession of the entire body) What is the difference between a person who is wicked and a person who is evil? Are there differences between the two? Don’t both come to the same crime, to the final condition- that being, destruction. Sodom and Gomorrah - 10 But the men inside reached out and pulled Lot back into the house and shut the door. 11 Then they struck the men who were at the door of the house, young and old, with blindness so that they could not find the door. 12 The two men said to Lot, “Do you have anyone else here—sons-in-law, sons or daughters, or anyone else in the city who belongs to you? Get them out of here, 13 because we are going to destroy this place.** The outcry to the LORD against its people is so great that he has sent us to destroy it**