THE denial of a scheme wholesale is not heresy, and has not the creative power of a heresy. It is of the essence of heresy that it leaves standing a great part of the structure it attacks. On this account it can appeal to believers and continues to affect their lives through deflecting them from their original characters. Wherefore, it is said of heresies that "they survive by the truths they retain."
~Hilaire Belloc: The Great Heresies.