LIKE I KNOW HES CUNNING AND WORKING BEHIND THE SCENES BUT HIS GOAL IS THE DESTRUCTION OF THIS CORRUPT RELIGIOUS ORGANIZATION. The nobles arent paragons of virtue either(they outcast the poor and they cheat on their wives, use daughters for transactional relationaships, use the people's tax to fund their extravagant lifestyle).
In fact, hes quite like a deliverer of justice. Objective and ruthless. It just so happens, the path to achieve his goals crosses our Mc's life.
LIKE THEY REALLY DONT NECESSARILY HAVE TO BE ENEMIES.