What redtom said is incorrect. People with faith can join the Communist Party. For example, Uighurs have 1.1 million Communists and Hui have 1.4 million Communists. They are all Muslims. However, it is forbidden for Communists to organize religious activities and publicize religion. They can only participate in activities as ordinary believers.
Communists: it is forbidden to do business, accept gifts and entertain with public funds.
Except that the 7 most senior officials must be Communists, all other officials can be people of other parties and non parties. At least one vice chairman of the NPC Standing Committee is a Muslim.
If you want to go into politics, you don't have to be a communist. If you become a Chinese communist, it doesn't mean you will have preferential treatment, even it means sacrifice. In the 2008 Wenchuan earthquake, the army needed 15 paratroopers to parachute under the conditions of night, rainstorm and lightning to restore contact with the disaster area. Theoretically, parachuting under this condition had a mortality rate of 30%, and Fifteen Chinese Communist volunteered to take part in the operation; In 2020, 42000 doctors volunteered to go to Wuhan for treatment of COVID19, of which 83% were Chinese Communists; In August 2021, City wide nucleic acid detection was carried out in Zhuzhou, Hunan Province (my hometown). All Chinese Communist Party members were required to wear protective clothing and help medical personnel free of charge.
Xi Jinping is the highest ranking official, but his status is equal to the other six. The Communist Party of China adopts a democratic centralized system. If major issues such as personnel and resource allocation are involved, the Party committee at the same level must vote. Xi Jinping and the other six members of the supreme Party committee have only one vote.
Of course, this is only a theoretical situation. After all, I'm not one of the top7, and I don't know the truth.