AHC - an East Asian Christendom

Christendom, for these purposes, being a community of Christian nations bordering and intermittently at war with pagan and Muslim nations; the Christian nations are at least nominally under the authority of both a religious leader - a patriarch in this case, perhaps? - and a secular overlord or emperor, and at least nominally (probably very nominally in many cases!) consider their religious bonds with their fellow Christian states more important than their differences.

Have at it, if you can!
 
The best-case-scenario for it would be having spanish and portuguese catholic missionaries successfully convert the Ming Dynasty. I heard from somewhere that some late Ming period emperors were considering conversion, but were interrupted by the Qing avalanche. It also doesn't help that the jesuits once came to a consensus that chinese traditional rituals were idolatrous, but that was in 1645, so it could be butterflied away.
https://www.britannica.com/event/Chinese-Rites-Controversy
Other than that, it's a tall order. Nestorian Christianity was another option, this time brought by missionaries on horseback rather than boat, but it was too tolerant of differing religions to fit your bill. Still, i postulate that a nestorian China could be possible with a ''no An Lushan Rebellion'' scenario.
 
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The best-case-scenario for it would be having spanish and portuguese catholic missionaries successfully convert the Ming Dynasty. I heard from somewhere that some late Ming period emperors were considering conversion, but were interrupted by the Qing avalanche.
Other than that, it's a tall order. Nestorian Christianity was another option, this time brought by missionaries on horseback rather than boat, but it was too tolerant of differing religions to fit your bill.

I wonder if it would be too cliche to pull the 'no Islam' card (I know I mentioned Muslim neighbors in the OP, but eh; maybe just prevent Muslim conquest of Iran and points beyond) and see what develops on the Nestorian front in that case? It may not remain so tolerant if it somehow comes to power in China in the post-Tang period, for instance.
 
Joseon Korea could've actually seen a thriving Christian population if Injo wasn't quite as horrible.

Story goes that after the Manchu defeated the Joseon for the second time (both invasions triggered by Injo's anti-Manchu attitude and the coup that actually got him on the throne), Injo's first two sons had to go to the Manchu as hostages. After the Qing conquered Beijing in 1644, they returned, the eldest, Sohyeon, brought with him Western sciences and Catholicism that Jesuits in Beijing showed him and tried to encourage modernization along western/European lines. Sohyeon was found dead within a year in the King's room, bleeding from the head. Injo had him buried immediately and made the funeral paltry compared to what a crown prince's funeral would've been in those days. He had Sohyeon's children sent to Jeju Island, which is where political dissenters tended to get sent, and his daughter in law executed for treason after she tried to find out what happened to the crown prince.

Anyways, say Injo dies like he should've but earlier so as to reduce the damage he did to the peninsula. Sohyeon apparently had a favourable view towards Christianity, seeing as he brought it with him, and a amiable relationship with the Qing (more open-minded and willing to cooperate with foreign entities, unlike his father). Christianity, being tied to trade with Europeans, could flourish like Islam in SE Asia. Then we have a majorly Christian Korea a few centuries early (current day Korea's about 25% Christian, though the vast majority are undeclared or atheist).
 
The best-case-scenario for it would be having spanish and portuguese catholic missionaries successfully convert the Ming Dynasty. I heard from somewhere that some late Ming period emperors were considering conversion, but were interrupted by the Qing avalanche. It also doesn't help that the jesuits once came to a consensus that chinese traditional rituals were idolatrous, but that was in 1645, so it could be butterflied away.
https://www.britannica.com/event/Chinese-Rites-Controversy
Other than that, it's a tall order. Nestorian Christianity was another option, this time brought by missionaries on horseback rather than boat, but it was too tolerant of differing religions to fit your bill. Still, i postulate that a nestorian China could be possible with a ''no An Lushan Rebellion'' scenario.
The Ming Dynasty did convert at the very end--though it was only when their rule was restricted to South West China(Yongli Emperor and his son both converted).In better circumstances,they would not have done so.The reason why they even converted probably had a lot to do with how they were begging for aid from the west.
 
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Joseon Korea could've actually seen a thriving Christian population if Injo wasn't quite as horrible.

Story goes that after the Manchu defeated the Joseon for the second time (both invasions triggered by Injo's anti-Manchu attitude and the coup that actually got him on the throne), Injo's first two sons had to go to the Manchu as hostages. After the Qing conquered Beijing in 1644, they returned, the eldest, Sohyeon, brought with him Western sciences and Catholicism that Jesuits in Beijing showed him and tried to encourage modernization along western/European lines. Sohyeon was found dead within a year in the King's room, bleeding from the head. Injo had him buried immediately and made the funeral paltry compared to what a crown prince's funeral would've been in those days. He had Sohyeon's children sent to Jeju Island, which is where political dissenters tended to get sent, and his daughter in law executed for treason after she tried to find out what happened to the crown prince.

Anyways, say Injo dies like he should've but earlier so as to reduce the damage he did to the peninsula. Sohyeon apparently had a favourable view towards Christianity, seeing as he brought it with him, and a amiable relationship with the Qing (more open-minded and willing to cooperate with foreign entities, unlike his father). Christianity, being tied to trade with Europeans, could flourish like Islam in SE Asia. Then we have a majorly Christian Korea a few centuries early (current day Korea's about 25% Christian, though the vast majority are undeclared or atheist).
While that's an interesting scenario, i'm afraid it doesn't cover what OP asked for, unless christianity spreads rapidly from Korea.
 
Not just Korea, Luzon is a possible area for Nestorians to spread, the problem is that the people there are illiterate.
 

Artaxerxes

Banned
Nestorianism takes off in the Steppes and plays of Zoroastrianism and Islam against each other in the more isolated parts of Iran and Middle East.

Coptic Egypt survives the Islamic outburst and eventually takes over Egypt entirely. It expands via India and East Africa.
 
The Shunzhi Emperor (first Qing emperor to rule China itself) was actually childhood friends with the Jesuits and showed inclinations towards converting to Catholicism, but then when he grew up he became a zealous follower of Tibetan Buddhism instead.
 
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