They also have WAY MORE Muslims than us too, and they have had some terrorist incidents within their country. That’s a little background on what is happening in China.
In the Xinquiang Uyghur Autonomous Region (northwest China) there are around 12,000,000 Uyghurs with over a million in the capital of Urumqi. They are Turkic, related to Uzbeks and speak a similar language.
Han Chinese have been trying to “colonize” the region for decades by achieving rough parity with the Uyghur population.
The best that Beijing can hope to do is isolate the Uyghur population within the province proper while increasing Han numbers as before. The regime can do ethnic/religious cleansing in the rest of the country, but it’s a tall order even for a system where human rights are not a priority.