I live yet. I don't know when I'll be able to start up on the mod again, I'm not living at home at the moment >.> When my stuff gets here and my family and whatnot I'll have access to my modding stuff and might start up on it again, I've been kicking around some stuff in my head.
Hmm... I've been kinda brainstorming off and on throughout this project on how to incorporate the beliefs and religions of these people, I don't know how far it'll go though. You might be able to get blessings from shamans to increase morale before battles to increase motivation and morale, as I think its fair to say they had significant pull over the clansmen.
Yes. Abrahamic religions didn't exist at that time. Most agree prehistoric peoples were mainly Animists, like old Shinto or Native American traditions. As such, it affected their day to day lives and decision making, so maybe it would be worth incorporating.
I was kicking around an idea for a Norse themed mod, in which you'd gain Favor of the Gods when doing badass/heroic/religiously honorable things like recognizing shrines or making offerings when appropriate. Favor might save your hide in battle from time to time or grant you boons when you need them, and horrible things might happen if you offend the Gods too much. I dont think I'll be doing anything that involved though.