Have you ever known someone you were convinced was strongly demonically influenced/ possessed?
The term “possession” is not really in the original language of Scripture. The word “demonized” is. So the idae of possession is to be demonically influenced (strongly) or even controlled.
Most of us probably believe that a demon can control a lost person under certain conditions.
We might disagree as to how much influence a demon can have on a believer, but most of us believe in the idea that we are under attack, at times, by the powers of darkness.
Discussion