***A China that's Christianized would not be a threat to the United States***
Unless that United States becomes so anti-Christian that it is a threat to the Christian world.
That's certainly an interesting thing I've occasionally contemplated.
Dimitri Duduman's visions of China invading and controlling the Western half of the USA in the not too distant future included seeing Chinese Christians in the Chinese army turning at some point and fighting with the Americans against the rest of the Chinese military on our soil. An interesting prospect, certainly.
That was after, BTW, the Chinese general in California ordered all Californian's killed--many buried alive in mass graves. He supposedly will be assassinated in San Francisco and that will evidently stop that hideous practice.
We shall see.