In wuxia fiction, religious individuals and organizations are most commonly associated with either Buddhism or Taoism. This is understandable considering that these were the two most dominant organized religions in China during the centuries that most wuxia stories take place. There are also the occasional Manichaeist or even Muslim, but Christianity is largely unrepresented in wuxia fiction.
This too is based upon historical reality: Christianity had virtually no presence in the Chinese consciousness until Jesuit missionaries from Europe began arriving in China during the Ming Dynasty, and even then, Christianity did not really make any headway among the Chinese population until well into the Qing Dynasty...by which time most wuxia stories had already passed.
But what if a significant Christian presence had entered China by, say, the time of the Tang Dynasty? What if Christian martial arts sects had appeared in wuxia stories set during the Sung, Yuan, and early Ming Dynasties? Things could get interesting. In the wuxia stories we know, Buddhist and Taoist sects such as Shaolin, Cheun Jen Sect, Mo Dong Sect, and Ngor Mei Sect often had conflicts against one another for various reasons, but religion was never one of those reasons. There was remarkable religious tolerance in wulin. Medieval Christianity, however, had a mindset of either converting the "heathens" (and thus, "saving" them) or destroying them as infidels.
Moreover, would a medieval Christian sect in Chinese wulin have been willing to train in chi and other advanced skills, which they might have interpreted as "Satanic?"
Things to think about.