Spirit possession is an unusual or an altered state of consciousness and associated behaviors which are purportedly caused by the control of a human body by spirits, ghosts, demons, or gods. The concept of spirit possession exists in many cultures and religions, including Buddhism, Christianity, Haitian Vodou, Dominican Vodou, Hinduism, Islam, Wicca, and Southeast Asian, African, and Native American traditions. Depending on the cultural context in which it is found, possession may be considered voluntary or involuntary and may be considered to have beneficial or detrimental effects on the host.
In a 1969 study funded by the National Institute of Mental Health, spirit possession beliefs were found to exist in 74% of a sample of 488 societies in all parts of the world, with the highest numbers of believing societies in Pacific cultures and the lowest incidence among Native Americans of both North and South America. As Pentecostal and Charismatic Christian churches move into both African and Oceanic areas, a merger of belief can take place, with demons becoming representative of the "old" indigenous religions, which the Christian ministers attempt to exorcise.
Baptism with the Holy Spirit and Holy laughter
From the beginning Christianity, have held that possession derives from the Devil (i.e. Satan) and demons. In the battle between Satan and Heaven, Satan is believed to engage in "spiritual attacks", including demonic possession, against human beings by the use of supernatural powers to harm them physically or psychologically. Prayer for deliverance, blessings upon the man or woman's house or body, sacraments, and exorcisms are generally used to drive the demon out.
Some theologians, such as Ángel Manuel Rodríguez, say that mediums, like the ones mentioned in Leviticus 20:27, were possessed by demons. Another possible case of demonic possession in the Old Testament includes the false prophets that King Ahab relied upon before re-capturing Ramoth-Gilead in 1 Kings 22. They were described as being empowered by a deceiving spirit.