You could just google this stuff. But the Chinese government has been burning Churches, burning crosses on Churches. And there’s over a million Muslims in China that are in a “re-education” camp. So, God only knows what the conditions are like in there.
Also, the Chinese government is the only government in the world today (to my knowledge) that wants to appoint its own Bishops, different from the Vatican. Not to mention that the state-sanctioned Catholic Church teaches that abortion is acceptable, along with a whole host of heresies that the state wants it to teach. There is an underground Catholic Church in China which is much more faithful, and loyal to the Pope ie: truly legitimate. So, there are many problems with religion in China. Most of it stems from the Communist regime there. If you know anything about North Korea, its like the repression in North Korea, except perhaps not as bad. I think China likes to keep North Korea because it makes their human rights violations look better by comparison. But they are still among the worst in the world.