Sinicizatied Christianity: How has China tampered with Christianity?

I still remember CCP put a seal on the door of our church (This is the church I go to regularly) with a notice which requires "religious believers to abide by the provisions of laws and regulations and participate in activities at religious venues registered in accordance with the law." This is their excuse. In China, the so-called legally registered religious venues are religious venues that are managed by the government and obey the CCP. In this "church", the images of Jesus Christ and the Virgin Mary were removed and portraits of Xi Jinping and Mao Zedong were placed.
CCP agent (party branch secretary) will attend Sunday services and they are responsible for monitoring us. He closely monitors the content of sermons in Three-Self churches. He required pastors to read the new version of the "Regulations on Religious Affairs" before preaching. During worship, we believers were forced to sing the national anthem, and he even forced us to sing 红歌 praising CCP.
CCP require us that We christians must adhere to the leadership of the Chinese Communist Party and the core values of socialism. They strictly require religious clergy to preach the Core Socialist Values in their sermons and integrate our into the minds of believers, into our collective religious activities, and into our daily life.Yes, the most terrifying thing is the Sinicization of Christianity, which is they suppression to our Christianity.