What's been said about religion before in the forums:
There should be all kinds of religion, Nine Divines, Tribunal etc in TES 5.
Each religion should have their own temples and so on...
What I think :grad: (Sorry if some1 proposed this b4, can't read everything):
Religions should be considered factions and there should be different perks and rewards for joining (or not joining) a religion, such as weapons, armor, spells, houses, locations, mounts, friends, abilities... all kinds of stuff. That "stuff" should be related to the religion you worship. For example you could be rewarded with dwemer items and artifacts (or chimer) if you join the Tribunal religion and so on...
Quests about religion and interreligious issues are fun and interesting, but the classical religious quests such as searching for powerful old weapons never go old.
I think knowing some lore should give the player some extra rewards. Reading a book or scroll telling a legend of a lost weapon of a religion or even lost city should give you a quest to find the weapon or city. For example if I go the the bookstore and buy an old scroll telling a legend that says Vivec (Tribunal god-king) once lost his favourite Socks of Warm Feet when he was out picking mushrooms, then I might be intrigued to go look for those socks, or even worshiping the Tribunal religion to gain information about it. Going treasure-hunting is fun, especially if the weapons and cities actually exist in-game (they mostly don't today :banghead: ).
Thx for reading! :tops: