You don’t want to be a Christian in China. They put believers in jail.
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I strongly suspect there are large numbers of Christians in China who are not in jail and not threatened with prosecution unless they overtly call attention to their religious activities.
Of course not all believers are in jail. And yes you can worship there as a foreigner, especially if you attend a state approved three self patriotic movement church.
But they tyrannize the churches and the believers. Imprison one and you intimidate a thousand. It’s no secret. Visit voice of the martyrs or something. There is not religious freedom in China.