Just a few thoughts...
Opportunists
If I remember correctly, religion in Gaia has only recently come back into fashion after a long hiatus by the gods (humanity even forgot their names). With the sudden resurgence in the popularity of religion it is almost certain that oppotunists will try to step in and create their own religions to swindle the gullible out of money. (Mort is convinced that Orkistism is one of those religions). It seems likely that the business of two-bit mages posing as prophets and priests would be booming in Gaia right now.
Afterlife
I don't see a lot of mention of afterlife in your descriptions (except for a mention of hell in Orkist's description). Most religions are deeply concerned with the afterlife and use it as both a whip and carrot to prod their followers into obediance. It might be good to mention the individual beliefs of each religion.
Magic & Religion
There is no question that Magic is THE competition for religion. Notice the resurgence of religion in the Celestine empire coincides exactly with the suppression of Magic. As religious sentiment continues to grow I would expect to see greater polarization between magic and religion. Religions like Orkistism that rely on people with magery may find the going tough as they compete with the guilds for the same talent pool. Since government will be naturally hostile to members of the "illegal" mage guilds, some short-sighted officials may look to priests to fill their need for War Mages, scryers and other magical talent, further cementing the relationship between religion and government and funneling government money to the church's coffers. Man... that is starting to sound pretty apocalyptic.