The religion system is incomplete to say the least.
Bugs aside (I think we can all agree just to fix whatever bugs there are), there needs to be more added and some adjustments made.
I don’t like the idea of the religions being all learned. I think the one you start with should be the one you have and that is it. Of course a lengthy quest to change religions could be placed in and that’d be fine. But the religions need to be more than just feats.
So here’s a rough draft on how I’d like to see it. You start with a religion and at level 20 or so, you can go to the religious teacher to get the next ‘rank’. You perform a quest for them and they teach you the new stuff and allow you to upgrade your altars. And then again at 50 or so. And then finally you do a final quest to make your diety’s legendary weapon. Something cool, some dialogue, ton of lore, all that good RP stuff.
The quests would revolve around the Deity’s nature. Something involving sacrifice and snakes with Set, righting wrongs and meting out justice for Mitra, offering the various peoples to the pits for their wisdom for Yog, ect.
The items you can make at each altar need to be on par with every other religion. Fix the disparity so certain religions aren’t better than others, just different. And I think allowing only one at a time would fix the issue of Set/Mitra being the go to religion as it would allow better stuff on the others.
I’d also like to see the religious garments have a full 5 for all religions, and have stats on them. Even if it was Survival or Encumbrance. They look good, and its a shame we don’t have much use for them.
Not only would I like to see the choice of god for the individual be important. But for entire groups of people, and even entire clans. I’d like to see rituals that take multiple players to pull off. These could have interesting effects like buffs, or hexes in an area. But only work if there is no opposing deities in the area (Crom worshipers do not count against this)
And finally Crom, the lore states that praying to Crom has no benefit, for he gives no aid to his followers except for the strength at birth to crush their enemies. So Crom has no altar and no quests, and no priests. But choosing Crom means you eschew the benefits of all others. This should come as a benefit to itself. At level one you get +1 to STR, at 20 its +3, and finally +5 at 50.
And while I understand that this potentially grants up to 50 attribute points depending on build. I would like to see the benefits of the other religions match that. A player should stare at their character creation screen for a minute pondering.
Also, the Crom bonus is lost if you do a religion switch quest. Once you turn from Crom, you cannot go back. His ‘blessing’ was given only at birth. Gotta stick with the lore here.