AHC: Zoroastrianism w/o nerfing Islam

How would you have Zoroastrianism survive until modern times at or above about 5% of the world's population, while not making Islam smaller than Zoroastrianism, or making any serious dents in the other 3 major religions?
 
Not sure if this is ASB or not, but an alternate history mod I made for a game entitled Europa Universalis III had part of the Sassanid family flee east along with a portion of the population (POD being a weaker Islamic offensive), taking better defensive positions there, the result being an Indo-Persian Zoroastrian state.

Probably ASB.
 

Deleted member 67076

Have several Kingdoms in India, East Africa and Central Asia adopt it as their state Religion and have a native Zoroastiran population grow there as well. Islam didn't really penetrate those areas until the 900s-1100s.

Meanwhile, you could help the Religion by having the Zoroastrians become something like the Copts in Egypt.
 
I think it might revolve around the 'colonies' of Islam; that is, far-flung regions such as central Asia, Indonesia, etc.
 
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