Exorcism
In Catholic Christianity, exorcisms are performed in the name of Jesus Christ. A distinction is made between a formal exorcism, which can only be conducted by a priest during a baptism or with the permission of a bishop, and "prayers of deliverance" which can be said by anyone.
The Catholic rite for a formal exorcism, called a "Major Exorcism", is given in Section 11 of the Rituale Romanum. The Ritual lists guidelines for conducting an exorcism, and for determining when a formal exorcism is required. Priests are instructed to carefully determine that the nature of the affliction is not actually a psychological or physical illness before proceeding.
Exorcism in Christianity
The British Methodist Church holds that the ritual of exorcism involves "the casting out of an objective power of evil which has gained possession of a person." Moreover, the Methodist Church teaches that "the authority to exorcise has been given to the Church as one of the ways in which Christ's Ministry is continued in the world." A minister must first consult the District Chair in order to perform an exorcism. The Methodist Church holds that it is of great importance to ensure that the presence and love of Christ is assured to the individual(s) seeking help. In addition, the ministry of the "Bible, prayer and sacraments" should be extended to these individuals as well. A combination of these things has been proven to be effective.