I remember something I heard years ago. They asked a preacher, what it would look like if Satan took over.
He said, that there would be no prostitution, no profanity, people would be kind to each other, and the churches would be full every Sunday, where Christ isn’t preached.
Satan “took over” when Adam ate the fruit of the tree of knowledge of good and evil. His wife was tempted, but he was not, take note. The phrases “prince of this world” and “god of this world” are references to Satan.