Battlemaster is all about the big themes and politics and wars in the middle ages (I believed someone called it MediPunk), one of the standard tropes is the firebrand preacher who declares a state ally evil incarnate.
So far as I see it the priest game should be a balance, one can either gain power by converting nobles or by converting a -lot- of peasants. Both should be weapons of middling power, because through most of the middle ages the Church was an effective check on the powers of even the Emporer, whereas in BM one can just hand wave and say "Meh" if the religion followed by 95% of your peasantry excommunicates your realm.
