Heretic Mentor

There are four decks of cards in every church: the deck of light, the deck of hypocrisy, the deck of pagans, and the deck of heretics. When there are not enough stakes, the trial of heretics will always come before the heretics, so the heresy deck will always be incomplete, until a boy comes into the world... Well, actually this is a story about the Renaissance and technological revolution in a fantasy setting.