What's most interesting about this is that it's not made explicitly clear whether his powers come from above or below, both are given as possibilities.  And certainly his dark side was a result of his overdedication (or claims thereof) to piety.  This episode was aired several years before Jerry Falwell's rise to fame and the foundation of the Moral Majority, but the episodes undertones ("Who do you work for?") remind me of this.  Supernatural powers, demon summoning.