The Mongols held theological debates, for various reasons. It was a novel thing in that place at the time. Political reasons, cultural reasons, and pure curiosity from Genghis and subsequent leaders. The Mughal (term derived from mongol, although they had a tenuous relationship) leader Akbar did similar things about 300 years later.

I recommend reading Genghis Khan and the Quest for God if you want further information.

https://www.amazon.com/Genghis-Khan-Quest-God-Conqueror/dp/0...