Heterics are those designated by a specific religious sect as an evil and impure group, whether their practices are truly 'evil' or not. Thus, priests designated as Heretics try to hide their divine power to avoid persecution.
False Casting
You're able to disguise your spellcasting as that of a miracle and one that isn't being administered by yourself. You do not need to move your hands or speak in order to cast spells, and when casting a spell it appears as if it happened randomly. If one is to suspect you of being a divine spellcaster they must make an Awareness check versus DC 20 + Heretic Level + your Magic.
This alters Spellcasting.
Silent Devotion
So long as your Devotion is above 0, use Magic for the purpose of Deception and Persuasion checks.
This alters Devotion.