Context: 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.

Question: What is heresy mainly at odds with?
Answer: established beliefs or customs

Question: What is a person called is practicing heresy?
Answer: A heretic

Question: What is belief in a strongly held custom?
Answer: Unanswerable

Question: Who is a person who believes in a strongly held custom?
Answer: Unanswerable

Question: What is the term for embracing ones religion?
Answer: Unanswerable

Question: What is an utterance or action concerning God?
Answer: Unanswerable