The King in Green
The power of the Orthodox Union of Pelor is centered on Grun, but extends throughout Central Oerth. The Pelorians have great political power and have generally obtained superiority, they have the ear and are the official religion of every major faction in power today. They act as a force for peace and political stability, largely preventing all-out wars of conquest between rival factions. On the flip-side, because of Pelorian religious power, the populace generally does not tolerate other faiths in their communities, so any religion other than the main three is practiced secretly, or not at all.
There have been other deities in the past, besides the three: Pelor, Sehanine, & the Raven Queen though they are most surely extinct now. The three rose to prominence during the middle of the Nerathi Empire, gaining majority in a rapid transition from other faiths. It has been at least 500 years since a cleric of any other religion has publicly emerged in the known world of Central Oerth, other religions were rare even in the era of Corsala.