AHC: Two Persias, One Shiite, and the Other Zoroastrian

Challenge: With a Starting time, between 650s to 1600s, have Persia be divided by a Islamic Shiite Dynasty, and a Zoroastrian Dynasty.
 
Challenge: With a Starting time, between 650s to 1600s, have Persia be divided by a Islamic Shiite Dynasty, and a Zoroastrian Dynasty.

Unlikely but... Buyids get agressive and Turn Southern and Western Persia to Shiism. A Zoroastrian Dynasty who survived in Tabaristan conquers Northern and Eastern Persia. The number of Muslim-Zoroastrian Persians would be 50-50 or 60-40 between 900-1000 AD
 
Unlikely but... Buyids get agressive and Turn Southern and Western Persia to Shiism. A Zoroastrian Dynasty who survived in Tabaristan conquers Northern and Eastern Persia. The number of Muslim-Zoroastrian Persians would be 50-50 or 60-40 between 900-1000 AD

For extra flavor points can it be the Bavandids?
 
The Zoroastrian dynasties of the Caspian are cool, but the faith survived a lot longer (and survives today) in Yazd and Kerman. That area may seem marginal, given that all the "action" in Persian politics seems to transpire further west and north, but the area was quite important in earlier times (large population, vibrant textile industry, and adjacent to land/sea routes to India).

Maybe some Zoroastrian family could follow the route of the OTL Saffarids (establish presence in Southeast Persia, recruit tons of Turkic/Afghan slave soldiers, go west) but remain Zoroastrian? They then capture Rayy, cutting off the road between Baghdad and Khorasan. The Samanids then fall as well (internal conflict, slave-soldier revolt?), leaving Persia as a western half around Azerbaijan/Fars and an eastern half from Khorasan to Hormuz. The Persian-speaking Muslims of the Central Asian borderlands likely adopt some form of "Tajik" identity and consider themselves spectators in the West/East conflict. Rayy/Tehran and the Caspian probably remain hotly contested borderlands.
 
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