So, obviously this means that Iran stays Zoroastrian and there is no Muslim invasion of India, so there's obviously no Pakistan - I guess their religion continues to be Hinduism.
Islam probably doesn't spread to central Asia, and the Tatars later do not convert as well - if the Mongol Empire still happens? Or will it be butterflied?
I guess Arabs still expand to Syria and Egypt, maybe they'll be able to hold more Anatolia now, since they don't have to hold Iran? I don't know.
I'm also interested in all the religions and languages. I guess Islam and Arabic still spread to Egypt and Syria, if the conquer those areas.
Iraq - or Mesopotamia - remains Aramaic (and Assyrian in the north?)
And Afghanistan, what's with them? Are they Buddhist, Zoroastrian... or what?
Azerbaijan used to be Persian speaking until it was Turkified. Does that still happen?
Don't limit yourself to just the points are brought up. I don't have nearly enough knowledge about this area of history, but I'd like to know more.
Oh, and if you know any timelines dealing with this or similar POD, please can you mention them? Thanks!