Tarim Basin
Tengrism was introduced by Turko-Mongol nomads. Nestorianism and Manichaeism spread to the Tarim Basin and into China, but they never became established majority religions. Buddhism spread from the north of India to the Tarim Basin and found a new home in China. By about 1400 AD, the entire steppe west of Dzungaria had adopted Islam. By about 1600 AD, Islam was established in the Tarim Basin while Dzungaria and Mongolia had adopted Tibetan Buddhism.