ibis and hanumann would be cool.
i can add ishtar/ashtoreth, bel (already exists in the devkit files, so it was planned or thought of at some point) dagon, erlik, and asura as gods that could add something cool flavor-wise. but i am skeptical that new gods will be added as anything other than cosmetic placeables in the battlepass and bazaar.
i got nothing as far as ideas for mechanics of the religions. my expectation is that they will focus more on the pve content that surrounds the theme, as it seems to be the biggest part of every age so far.
as has been said elsewhere, the herald of daddy sag seems like a conscious wink from the devs that age of gods is where we are going, not to mention that the current jeb sag theme of chapter 4 doesnt fit with the age of war at all. feels to me like something that was planned for chapter 1 of age of gods, and the decision to allow for 4 chapters kinda put them in the corner of ‘what have we on the table for the next update’
pop-up religious-themed events a la the sorcery events would be cool. hopefully no use of the base spawner system for themed sieges, i think that was a fail. but with the work funcom put into the system i think it’s all but guaranteed to be used again. thematic chapter events similar to our current jeb sag stuff, with a chapter currency and it’s relevant merchants, champions of the religion to kill and get some token that will progress the mini-story of the current chapter. these are less ideas or hopes, and more my predictions.