The one you're talking about is religion, which is funny considering that communism is anti-religion, why are you surprised, my grandma goes to an underground Chinese church, religion was always bad in China.
You will notice most of the guards and police in Xinjiang are Uyghur, they're just not Muslim.
If you read NYT, you will see that they're pressuring them to "renounce Islam": https://www.google.com/amp/s/www.nytimes.com/2019/02/17/worl...
Also do you not hear the hypocrisy, why would CCP want you to break their national laws? CCP can break their own laws, doesn't mean you can. How about you break the national law on censorship next? It will become a slippery slope.