The Blog Fodder recently posted about old time preachers. I am old enough to remember the tent revival preachers that use to travel throughout the south. They shouted about sin, were backed up by a gospel choir, would invite people to come up and be saved, even did some faith healing; and when everyone was in the spirit they passed the plates.
But in the hills of Kentucky there was a Pentecostal group that kept their faith hidden. I always think of this story by Wendy Bagwell.
These groups are outlawed, but still exist in the hills of Kentucky and West Virginia.