First, he introduces us to Father Amorth, the elderly, elfin head exorcist of the diocese of Rome. And if it’s not, then this is just exploitation of an unfortunate soul with serious mental illness. C Forty-five years after directing The Exorcist — arguably the scariest movie ever made — William Friedkin still can’t seem to shake Satan. Then we meet Cristina, a 46-year-old Italian architect who claims to be possessed. If it’s real, you’d rather not see it. In the unsettling and also kind of hokey new documentary The Devil and Father Amorth, the 82-year-old director puts on his Leonard Nimoy hat, stands stiffly in front of the camera, and hosts what feels like a schlocky old episode of In Search of… With a rascally twinkle in his eye and the breathless hype of a carny barker, Friedkin explains that he’s about to show us — you guessed it — the first authentic exorcism that the Vatican has ever allowed to be filmed. Whatever the case, you’re better off rewatching the fake Linda Blair movie. And regardless of whether you were raised in the church and believe in God and the devil, there’s a chilling air of taboo voyeurism in all of this. What follows is the Catholic priest’s ninth attempt to rid this poor woman of her spiritual curse. Shot with a handheld video camera, the documentary has the cheap, grainy look of a snuff film. But as it goes on, and as Cristina begins to buck and thrash, screaming, “She belongs to me!” in a demonic caterwaul, something else creeps over you: the feeling that this is something you shouldn’t be watching.