Heh ... I like this idea ... especially if you can use favor points to buy Shin-Megami-Tensei esque dieties.
you could either have 3 "gods" Law , Neutral , Chaos
or 12 major "gods" the Arcana -> Fool, Magician .. Justice .. Death
or you could have them both overlap!!
So Neutral Points can go towards Fool, Magician, Lovers .. etc
and Law Points can go towards Justice, Emperor, Empress .. etc
and Chaos Points can go towards Hanged-man, Devil, Death .. etc
can spend Law points to get a Mechilzidek, Gabriel, or Anubis ...
can spend Neutral points to get a Susano-O, Cybele, or Titan ...
can spend Chaos points to get a Thanatos, Samael, or Seth
meanwhile Strength points can go towards getting a Titan, yet not a Cybele, while Death points can go towards getting a Thanatos, but not a Beelzebub.
Such gods could be *required* to accompany the Sovereign (or remain in capital) and be invisible/ immune on the strategic map yet VERY visible/deadly on the Tactical map ... :3
(would still add towards an army's "combat rating" on the Strategic map though)