Disclaimer: Whether or not you believe the Scriptures are of supernatural origin or not, and regardless of your interpretation or understanding of the source of evil in the world, whether the devil/satan is an actual entity or perhaps just an influencing spirit ubiquitous in nature and the tendencies of man, that is up to you. My point here is that we humans as a whole have for the most part been ignorant of the subtle and crafty tactics of wickedness, whatever the source may be. We are told in Scripture to be wary of the devil’s devices.
2Co 2:11 Lest Satan should get an advantage of us: for we are not ignorant of his devices.
Both of these images depict demonic possession. The Exorcist is an over dramatization which ‘misdirects’ the world to look for extreme graphic and obscene outward manifestations of demonic presence and activity. But the devil is much more subtle than to display his grotesque nature in a horn-headed, red-skinned suit with a spade-tipped tail and cloven feet. The primary demonstration of evil in humans who have been turned over to the devil is ‘taking pleasure in unrighteousness.’ This is what we see. Those sinister smirks and cold eyes of those who are slaves to sin and have to obey Abaddon.
2Th 2:11-12 And for this cause God shall send them strong delusion, that they should believe a lie: 12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness.
Gen 3:1 Now the serpent was more subtil than any beast of the field which the LORD God had made. And he said unto the woman, Yea, hath God said, Ye shall not eat of every tree of the garden?
Joh 8:44 Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father of it.