Re: Zoroastrianism and Manichaeism in China
In my opinion, the Mongols had a somewhat controversial influence on Chinese Nestorianism. In the short term, they contributed to its revival, many of them being converted to that Christian "heresy", but in the long term, they, in my opinion, rendered its future irrevocably bleak. Nestorianism in China had always been dependent on the Nestorian community of Sogdiana, whose prosperity was essentially a necessary (but, of course, not the only, as the decline of Nestorianism in the 9th century has shown) requirement for the existence of Nestorianism in China. Now, minority religions like Nestorianism find their adherents and generally their most active members almost exclusively in large urban centers, from where long trading caravans spread their beliefs across the West and East. Well, the Mongol campaigns are mostly notorious for their obsession with totally exterminating every city they found in their sanguinary path, especially in what concerns the conquest of Central Asia.
The Nestorian Church never recovered from that destruction of her administrative structure and unprecedented loss of manpower, while the remnants pretty much evaporated during the 14th century, due to the chaos and political disintegration that followed the collapse of the Mongol empire, as well as the appearance of the Black Death. Therefore, when Chinese Nestorianism began to gradually lose its popularity, because of the assimilation of the Mongol upper class to the vastly numerically superior Chinese population, a reemergence of it through China's contacts with Central Asia was practically impossible. Τhe Mongols had (temporarily) saved the branch, but poisoned the root. Perhaps, the same would have happened in Iraq, but there Nestorianism had a much longer and stronger tradition even when compared to that of Sogdiana, also extending to the countryside.