AH Challenge: Nestorian Central Asia

Here's a challenge. Have all of the territories that comprise former Soviet Central Asia (the nations ending in "-stan") be majority Nestorian Christian in the present-day.

Bonus points if Islam remains a substantial world religion.
 
POD. Khosroe II not murdered and defeats the Arab invaders. Persia blocks expansion of Islam into Central Asia (although it spreads along the coast of the Indian subcontinent and beyond). Nestorianism, Manicheanism, Buddhism survive in Central Asia. Islam turns south and spreads down East African coast, spreading much further inland than in OTL and with greater cultural, linguistic and technical influence.
 
The next question is how to get Nestorian Christianity dominant in the region. Know very little about the region so need to do some reading...One thought that springs up is that could in this time Ghengis Khan be a Nestorian Christian...?
 
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