Possible Clues:

• A belief contrary to the orthodox
• Belief that's anathema to the orthodox
• Diet of Worms concern
• The wrong idea? This is why I speak
• Unconventional view in this place's yard
• One of Joan of Arc's crimes
• Unbelief
• A pointing out of almost the last character in Gnosticism?
• Belief opposed to the norm
• Where synod squashes unorthodox belief