This was also one of my favorite episodes that I have watched on X-files. Even if the audience think that this guy is maybe fake, he's actions was tell a different story...
The FBI is called in to assist Sheriff Maurice Daniels who thinks that a young preacher, Samuel Hartley, is responsible for several deaths. Since he was a young child Hartley has reputedly been able to cure the sick by the laying on of hands. As a boy he revived someone who had been badly burned and pronounced dead at the scene. He and his stepfather, Calvin Hartley, now run a revival-like tent ministry but Samuel's attempts at healing has resulted in several deaths. As far as Sheriff Daniels is concerned, Samuel is a murderer and wants to get the proof to arrest him. Mulder isn't so sure and wonders if there might be other forces at work.