I'm not yet sure what impact religion will have on the game yet... though I have plenty of source material to draw from from my days of running pencil-and-paper RPGs.
i was thinking race religions would effect npcs motives ex: human npc must worship at shrine before sleeping
also if players pray at them they get skyrim style perks (one of the few things from skyrim we can incorporate into mythruna)
ex reptilian shrine increase swimming speed dwarf shrine increase chance of finding cool ores and simian shrine increase climbing speed
ps npcs who pray at these shrines should also get the perk