Actually, exorcism isn't even restricted to Christianity. In Islam, possession is attributed to jinn, not demons. My wife personally witnessed an Islamic exorcism: a young lady of about 18 was apparently possessed, and brought before a muslim cleric. He summoned another young girl (probably around 13 or 14 years old), and said that he was going to work through her to exorcise the possessed girl (don't ask...I don't know). He then proceeded to talk to some other jinn through the younger girl, and told the jinn to "burn" the possessing jinn, in effect killing it. The younger girl, who only spoke Portuguese, spoke in fluent Urdu in a man's voice the entire time. My wife says that the screams from the older, possessed girl were horrifying in the least, and she still has nightmares about it.
Hey, Alex & all! I'm a lurker from South Africa. Seems like everyone here is a Neatorama addict--it's an awesome addiction. I'm a technical writer currently, but aspiring to be a novelist. Love the site, and congrats on the milestone!