Read this: Heresy is any provocative belief or theory that is strongly at variance with established beliefs or customs. A heretic is a proponent of such claims or beliefs. Heresy is distinct from both apostasy, which is the explicit renunciation of one's religion, principles or cause, and blasphemy, which is an impious utterance or action concerning God or sacred things.

What is heresy mainly at odds with?
What is the answer? (If it cannot be answered, return "unanswerable")
established beliefs or customs