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alternatehistory.com
-Persia becomes Christian
AND
-A Dynastic or Personal Union between the Sassanid Empire and the Göktürk Khaganate(therefore, the Turks become Christian too)
The Persians becoming Christian idea was already employed here, but as I see, it looks dead, so I took the liberty to ask HistorianofAlt about re-using his idea and combining it with another.
Let's see what he has to say about it.
Until he replies, I won't be able to do anything.
If he lets me to re-use his idea, I may begin making a timeline.