Over the course of his career, Father Amorth claimed to have performed tens of thousands of exorcisms, at least 60,000, and became one of the most prominent and controversial figures in the Catholic Church in the modern era.

Even accepting Amorth's claim that only 94 of his 30,000 exorcisms represented full-blown possession, that would have required roughly one case a month to be thoroughly examined and processed over nine years with hardly a break.

He also attributed the number of exorcisms performed to his opinion that "People have lost the Faith, and superstition, magic, Satanism, or ouija boards have taken its place, which then open all the doors to the presence of demons.

"[16] According to Amorth, the Catholic Church sexual abuse cases were the result of the work of demons on some priests, who "were not possessed, but rather tempted by the devil.

In addition, he must rely solely on the "Word of God" and traditional prayer, be completely detached from monetary concerns, be profoundly humble, and treasure obscurity.

The books include references to the official Roman Catholic teachings on demonology while the main emphasis is on Amorth's experience as an exorcist.

[18] He states, "A curse can originate from such things as maledictions by close relatives, a habit of blaspheming, membership in Freemasonry, spiritic or magic practices, and so on.

The 2017 American documentary film The Devil and Father Amorth, directed by William Friedkin, presents the exorcist at work in an Italian village.