I will be reforming Zunism
Unyielding nature for home defense,
Dawnbreaker and Stability for incredible vassal opinions, Divine Marriage gives a huge bonus to vassal opinion, and with polygamy you can avoid inbreeding. Stability gives the Jain bonuses for vassal opinion. Add theology focus to that and you get a + 20
temple vassal opinion on top of that.
I will use Hierocratic leadership, because I really enjoy the idea of a pagan "pope".
I'm kinda sad that I can't also pick Animism, because I feel like pagan religions in general (except for suomenusko) lack fluff, and that inititation ritual really seems like a nice piece of fluff I would love to have :/
Female leadership simply wouldn't work for this realm though. As a woman, you can't control avoiding inbreeding as well as a man can. As a woman, you are fertile from 16 to 40, and your relative-husband can impregnate you anytime, almost regardless of age. Maybe you can pick a homosexual relative-husband and have non-relative husbands on the side?
My religion will help me have big, stable realms that are easy to defend, and easily secured succession via numerous offspring. I also love that I will have the Festival of Sun events, and if I recall correctly, I still get to have Sky burial as a Zunist, right? Or was that never a thing?