I was the sound recordist for Peter Adair's film "The Holy Ghost People" and we spent one Summer and Fall filming their services each weekend. There is no question in my mind that most of the worshipers were completely genuine in their beliefs and actions. The few who weren't so sure of their faith were fairly obvious.
It was a powerful experience I will never forget it. I'm not about to become a Pentecostal Christian nor practice my belief the way they did, but I was was deeply affected by their sincerity and spirituality.
I have shot film all over the world and I have never experienced more friendliness and hospitality than we did on location in Scrabble Creek and Gauley Bridge, WVA in 1966.