I mean one option is Crystal Dragon Jesus. I was working on something like this for a radically different game.
Leader's Name: Regent Laborius the first (Original name: Dmirt Sunderhammers)
Leader's Race: Dwarf, the first dwarven Regent in fact
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Name of Religion: "Eastern" Halartinism
Leader's Title: Holy Regent of the Light (Regent)
Type of Religion: Monotheism (With "great spirits" taking the role of saints)
Major Figures: The Holy Light, The Great Dragon Halartis, Many Greater Spirits
Central Tenets: Aid to the weak and poor, Destruction of the "Beast Races", submission to the church and the light, regular prayer and temple attendance.
Holy Seat: God's Blood Lake (where it is said Halartis slew the enemy gods),
Major Holy site: Hell's Rift (where the great dragon sacrificed himself to save the souls of the dead from demons by creating paradise)
Adherents: (45% humans 25% elves 10% dwarves 10% merfolk 10% other races)
Heresies and Competing Religions: "Western" Halartinism (Heresy, A less rigid form of monotheism, with the Greater Spirits referred to as gods and intervention asked directly, the magocite(see below))
Oltrusca (Heresy, They believe all souls are protected by Halartis in paradise, not just followers or the good)
Moddocun (Competing Religion, a vile form of devil worship involving blood pacts and sacrifices, imported from the beast races(this view may be colored by animosity)
Circlist (Competing Religion, they believe in reincarnation through six different worlds under six different gods and that you need to complete a "perfect" circle to ascend, most teachings are confusing and contradictory, reveling in paradox.)
Starting Crisis: "Western" Halartinism has begun purging mages as devil worshipers and usurpers of divine power, known as the Magocite. Halartinism has traditionally viewed magic as a dangerous and powerful force, but a natural one whose use is ultimately decided by the wielder for good or evil. There is a split in "Eastern" Halartinism temples and fortress-nunneries about whether to embrace the killing of mages or to protect them, and it has started becoming quite violent.