To begin, I should state how the Catholic Church defines heresy. You can find the definition in Canon 751 as well as the Catechism of the Catholic Church §2089. So here it is: Heresy is the obstinate denial or obstinate doubt after the reception of baptism of some truth which is to be believed by divine and Catholic faith. Not just “Catholic” faith, but “divine” faith too. Canon 750 tells us what sorts of things constitute “divine and Catholic faith.”... Read more