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alternatehistory.com
The Zhengde emperor, ruler of Ming China in the early 16th century, was very into exotic religions. He invited Tibetan lamas, went around wearing Tibetan clothes and blessing court women in mock Buddhist ceremonies, and gave himself the Tibetan name of Rin-chen dpal-ldan ("the Glorious Jewel").
At the same time, he kept an entourage of Muslims, had a deep attraction towards Muslim women in his harem, and banned the raising, selling, and butchering of pigs. He also gave himself the Arabic title of "Shaykh of the World" (Shaykh 'Alam).
What if the Zhengde emperor had chosen that Islam was in fact better than Tibetan Buddhism or any of the other exotic religions that caught his eye and made it his primary private faith? He had no children who survived to adulthood, but would the Long-term history of Ming China be affected in any way?