I agree with everything that Kyle said, but I would add something that I think that is prevellent in a lot of Penticostal curcles.
When I was a Penticostal, the main reason that I left the Penticostal Church at the time was that the Church I was in, was becoming involved with the Word of Faith movement.
If you don't know anything about the Word of Faith movement, some of the teachers include Kenneth Copeland, Kenneth Hagin, Benny Hinn etc...
Although it is true that there are many Penticostal Churches that speak out against this movement, I have found that many Penticostals themselves actually read and follow Word of Faith teachers. I learned this lesson not too long ago with a family member, who is a Penticostal. I mentioned some of the teaching of Benny Hinn and was soundly rebuked. Saying that I was not supposed to talk that way about the Lord anointed. When I said that Benny Hinn said these things himself and I wasn't saying anything that he wouldn't agree with. I made her angry and she said that she knows for a fact that what I said isn't true.

This is a double edged sword, because not not only in the followers eyes of people like Benny Hinn are we not supposed to say anythin g against them, we are not even supposed to say things that these Word of Faith agree with.
I had one other person tell me that I am quoting these people out of context, and when I asked them what they believed they meant by the statement, they could not or would not answer me.
I mention all this, because of the fact that cults like the Word of Faith movement have a hold on their followers that is very hard to break. As well as the fact that the subjective and emotional nature of the Penticostal movement breeds this kind of thing in its people.