>>18324634
If they didn't fight the Greeks for over 600 years

The Zoroastrian priestly class by that point were the problem, completely corrupt and greedy and retarded. The king and his immediate posse needed to completely purge the priests as well as the other disloyal noble families, revamp and the economy and industries instead of blowing all their money and men, AGAIN, for the thousandth time, fighting byzantines when the rest of the empire is completely degraded and undefended

>>18324634
No last great war at the end of Antiquity, Khosrow II just let's Roman politics play out or at the very least capture a some vital forts but doesn't get too greedy and attempts to recreate the Achaemenid empire. Even if the Persians won they would be exhausted/over stretched and arguably do worse than in our timeline. Persia was more interested in Arabia than Rome so if they saw the Muhammed growing in power they could actually stop/manage it instead of being distracted. They did stop Axum from building an Arabian empire despite it being on the other side of Arabia so this wouldn't be difficult as long as they aren't distracted.

>>18324634
Zoroastrianism was never the 'dominant religion' in terms of having mass appeal. The real question is how did vedic religous thought manage to survive in india, despite beung centered around concern for oppressing the majority of its followers?

>>18327002
>Zoroastrianism was never the 'dominant religion' in terms of having mass appeal
How's the weather in London Ahmed?

>>18327034
Hows the weather in Cali, Reza ?

>>18328287
Kek