In December 2018, the Organization of Islamic Cooperation (OIC) with 56 Muslim-majority countries as members, based on fake information spread by Western countries, condemned China for its treatment of the Muslims in Xinjiang.
Following this, China invited the OIC to send..

..... a delegation to Xinjiang to see for themselves what is really happening there.
Following this visit, in March 2019 the OIC made the following statement:
[The OIC] Welcomes the outcomes of the visit conducted by the General Secretariat's delegation upon invitation from...

... the People's Republic of China; commends the efforts of the People's Republic of China in providing care to its Muslim citizens; and looks forward to further cooperation between the OIC and the People's Republic of China.
There is no atrocity on the Uyghurs in China....

.... What you people have read are fake news from the West to badmouth China.
Yes, they really hate China’s economic success. It might make China the most powerful country in the world in future! And the West, in particular the US, can’t have that!.......

...So they try their best to get the world to hate China and stop trading with China.