I like it, though I wouldn't mind a bit more fluff on them. My only real issue is the Charisma penalty when their favoured class is Cleric. One of a Cleric's prime requisites is Charisma.
Done for two reasons: to balance out their bonuses a bit and to fit with the flavor Nevermind. Super-fanaticism seems more like a strong personality. I'm thinking of changing that. Changed. Look better now?