I'm always surprised how little interest there seems to be from the international muslim community in the Xinjiang situation, given that at least parts of it really blow up over even minor anti-Islam actions by single individuals quite regularly. The actions of China seem at least in part aimed at extinguishing Islam as a religion in the region, which would seem far worse than some person drawing a cartoon. But maybe…
Not really.
Islam has been present in China for over a thousand years, and the Uyghurs do not represent the majority of muslims in the country, which are actually the Hui (ethnic Chinese who converted) and outside of Xinjiang.
For the Chinese government this is a question of national unity against separatist movements, which is a more ethnic than religious problem, and political control. I'm thinking that they actually prefer Islam, which is unstructured, to the Catholic Church (hence action they regularly take against it) although, obviously from a communist stand-point no religion at all is the best option, and so Islam is not really singled out.
Many muslim countries also have strategic interests in having good relations with China, including Saudi Arabia, Iran, and Pakistan, and thus abstain from raising any issues, not least since China has also the advantage of not being involved in the Middle East and of keeping a neutral stance there. Now, there are anti-Chinese terrorist attacks in Pakistan but everyone tries hard to keep a lid of them for these reasons.
If anything, and cynically, the West would very much like muslim extremists to turn their attention more towards China because obviously that would be destabilising for China, and so the anti-islam narrative is pushed at every turn.