Disclaimer: before I go on - this post has nothing to do with merits or shortcomings of Islam.
Your challenge, should you accept it, is as follows:
With a POD after 1500 AD, create the chain of events that would lead to Islam becoming a minority or a very rare religion in Iran. It cannot be the religion of the ruling elite, and in fact must have no disproportionate influence (meaning TTL's Iran must NOT be an Islamic state). Bonus points if Iran returns to Zoroastrian faith. The more recent your POD, the better for the purposes of this challenge.
The limitations are as follows: it CANNOT occur due to a conquest by a foreign power or imposition of another religion by force from the outside, and by 2007, such non-Islamic Iran has to be an independent nation (although not necessarily a superpower), with ethnic mix not too dissimilar from OTL (i.e. it cannot be resettled by another ethnicity who did not follow Islam - this Iran still has to be Persian), and with Farsi being the primary spoken language.
Have at it!
Your challenge, should you accept it, is as follows:
With a POD after 1500 AD, create the chain of events that would lead to Islam becoming a minority or a very rare religion in Iran. It cannot be the religion of the ruling elite, and in fact must have no disproportionate influence (meaning TTL's Iran must NOT be an Islamic state). Bonus points if Iran returns to Zoroastrian faith. The more recent your POD, the better for the purposes of this challenge.
The limitations are as follows: it CANNOT occur due to a conquest by a foreign power or imposition of another religion by force from the outside, and by 2007, such non-Islamic Iran has to be an independent nation (although not necessarily a superpower), with ethnic mix not too dissimilar from OTL (i.e. it cannot be resettled by another ethnicity who did not follow Islam - this Iran still has to be Persian), and with Farsi being the primary spoken language.
Have at it!