When actor Russell Crowe began reading about the history of real-life Catholic priest Father Gabriele Amorth, who claimed to have performed over 50,000 exorcisms, he was intrigued.

"He left behind a whole bunch of his first-person experiences to read through. I think there are like a dozen books or something like that, you know. So, it was just his journey that really fascinated me to start with,” the 58-year-old said.