Exorcism
In Christianity, exorcism is the practice of casting out demons. In Christian practice 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. Protestant 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.
Exorcism in Islam
Possession is not caused by Satan, who is said to be just a tempter, whispering evil suggestions into humans heart, but, even though not mentioned in canonical scriptures, according to folklore by jinn, who can enter a human body physically or haunting them mentally. A possession by a jinn can happen for various reasons. Ibn Taymiyyah explained a Jinn could sometimes haunt an individual, because the person could (even unintentionally) harm the jinn; urinating or throwing hot water on it, or even killing a related jinn without even realizing it. In this case the jinn will try to take revenge on the person. Another cause for jinn possession is when a jinn falls in love with a human and thereupon the jinn possesses the human. Some women have told of their experiences with jinn possession; where the jinn tried to have sexual interaction from inside their bodies. Thirdly, it occurs when a jinn is evil and simply wants to harm a human for no specific reason, it will possess that person, if it gets the opportunity, while the human is in a very emotional state or unconsciousness. Jinn may also haunt someone in service of a sorcerer.