WI: Zoroastrian Persia defeats the Muslims?

In our real timeline, Muslims conquered Persia and turned it into an islamic Nation, although it kept its language.

What if Persia had defeated the Muslim conquerors? Without Persia, it’s a lot harder to spread Islam further east.

Would the Caliphates instead try even harder to conquer more of Europe and Africa?

Would the Turkish invasions be butterflied away, or would they still happen, and the result would be a Zoroastrian Central Asia? Or even a Tengri Persia?
 
A Tengri Iran or a Zoroastrian Central Asia are at best very unlikely. Turkish invasion depends. We would need to qualify how the Sassanids defeat the early Caliphate. As well, we assume that defeating the Caliphate once, incurs further victories. It certainly is not clear that the Sassanids can maintain wars as well as the Caliphate can. Ultimately, the Sassanid empire by 630, was ready to end, if you look at its ruler lists and its history, it was going through a roulette of rulers and when this occurs for an empire such as Persia or China or so forth, the Dynasty is near its end.
 
A Tengri Iran or a Zoroastrian Central Asia are at best very unlikely. Turkish invasion depends. We would need to qualify how the Sassanids defeat the early Caliphate. As well, we assume that defeating the Caliphate once, incurs further victories. It certainly is not clear that the Sassanids can maintain wars as well as the Caliphate can. Ultimately, the Sassanid empire by 630, was ready to end, if you look at its ruler lists and its history, it was going through a roulette of rulers and when this occurs for an empire such as Persia or China or so forth, the Dynasty is near its end.
So, what religion does Central Asia adopt ITTL? Buddhism? Eastern Orthodoxy? Does it still adopt Islam?
 
Considering that the Byzantines and Persians had heavily exhausted each other shortly before the Arabs burst out in Jihad, it would be easy enough have both empires in a period of strength, and that might well stop the Arabs from conquering either.

Given how very little was ever gained in Roman/Persian wars, and how much was spent (blood, money, effort, etc.), it would only have taken an outbreak of common sense to have had a period of piece at that time.

Of course, 'common sense' isn't very common.
 
So, what religion does Central Asia adopt ITTL? Buddhism? Eastern Orthodoxy? Does it still adopt Islam?

It will be a mixture fir the foreseeable future, with a Buddhism having a dominant edge among some and generalized traditional religions. There is also the presence of Manichaeism, Nestorianism, generalized dharmic ‘Hinduism’ and Zoroastrianism.
 
In our real timeline, Muslims conquered Persia and turned it into an islamic Nation, although it kept its language.

What if Persia had defeated the Muslim conquerors? Without Persia, it’s a lot harder to spread Islam further east.

Would the Caliphates instead try even harder to conquer more of Europe and Africa?

Would the Turkish invasions be butterflied away, or would they still happen, and the result would be a Zoroastrian Central Asia? Or even a Tengri Persia?
If the Persians stop the islamic expansion east, that that should prevent Islam spreading in India and Indonesia along the general population, Muslim traders could still spread the religion and language to the merchant calss, as it was useful for trade to have a common tongue and Islamic writing system made trading easier to document.
 
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