My brother recently liked a link on Facebook that his friend put up. To read the silliness see here.
Priests and other religious folk who perform exorcisms are doing the victim a disservice. There are no such things as demons but there are serious medical conditions that, if left untreated, could kill them. As the article states, the supposed tools to use against a demon are "Faith, prayer and fasting."
Faith is belief without or despite proof. It would be just as valid to believe that the supposed possessed is being tormented by God as by a demon since both demand faith. If we abandon faith in the unseen and use our abilities to reason, we can determine the true causes of a person's problems. There is a larger reason to reject faith that I hope to write about in the future.
Prayer has been shown to have no effect. Studies have shown that intercessory prayer is not effective. See here. The only effects seem to be psychological as shown in the study where those who knew they were being prayed for actual fared worse then either those who were not prayed for or those who were prayed for but did not know.
Fasting is one of the worst crimes exorcists commit against the supposed possessed. Forcing a sick person to starve themselves can be dangerous. Anneliese Michel died during an exorcism and was found to be severely malnourished.
Back to the silly article, the supposed exorcist made it seem like he was asking for help in a battle with demons. God was obviously too busy to prevent the demon from possessing one of his loyal followers and could not make an appearance in the battle himself. However, Pope John Paul II seems to be rather effective in fighting the good fight. Why the late Pope might be better then Jesus or Mary, who surely have been duking it out with demons for a longer period of time, is not made clear.