Exorcism in Christianity
Exorcism in Christianity is the practice of casting out demons from a person they are believed to have possessed. The person performing the exorcism, known as an exorcist, is often a member of the Christian Church, or an individual thought to be graced with special powers or skills. The exorcist may use prayers and religious material, such as set formulas, gestures, symbols, icons, amulets, etc. The exorcist often invokes God, Jesus and/or several different angels and archangels to intervene with the exorcism. A survey of Christian exorcists found that most exorcists believe that any mature Christian can perform an exorcism, not just members of clergy. Christian exorcists most commonly believe the authority given to them by the Father, Son, and Holy Spirit (the Trinity) is the source of their ability to cast out demons.
Gabriele Amorth
In October 2000, it was reported he had performed over 50,000 exorcisms (which ranged from "a few minutes" to "several hours" in length). In March 2010, he said that the number had increased to 70,000 . By May 2013 he said he had performed 160,000 exorcisms in the course of his ministry. Note that according to Father Amorth, each exorcism does not represent a victim of possession, but rather each exorcism is counted as a prayer or ritual alone, and some possession victims required hundreds of exorcisms.