The Church of Celestia
The church teaches that Celestia is the realm of the gods. Though there are many and all remain nameless to the mortals of the earthen plane, the truth was they watched over all the mortal races and guided all their actions.
Every child born was graced by Celestia and the gods within to be given life. Each person was gifted their favor in times of need when they showed their piety. Though the mortal races knew not which gods governed which forces of the world, it was known that the gods were always there through everything.
Of course, every rule has an exception. Celestia's grace had its own limits and could never grant its blessings to the demon-cursed. The demon-cursed were those who had high enough concentration of demon blood in them to be marked by Celestia. This mark showed the other members of the mortal races which beings were deemed unfit for the grace of the gods.