The Imiriaran Cycle
There is but one God. He created the universe and his firstborn son. God is worshiped by everyone on the Imiriaran continent (or at the very least, everyone pays lip service to Him). The entirety of the Church is dedicated to the worship of God. No one, not even His secret enemies, truly doubt that he is supreme in creation. Many are willing to go to war over the interpretation of His word. Although practically, war on the Imiriaran continent comes from political motivations, and the regional churches are fully in bed with the aristocracy.