I've never been exorcised, but I went to a therapist who tried to convert me, and actually wrote a book that claims all mental illness is due to a disconnection with God. The title of her book that she gave me is Hell and Madness; Grace and Sanity: the true biblical basis for mental health. I felt violated, because I had seen her a few times before she pulled this on me. Needless to say, I was pissed.