Depends on what you mean by witness persecution of Christians.
I observed first hand the heavy handed monitoring of the government churches by the Party overlords and stoolies.
And I knew personally folks who suffered greatly for Christian and other honorable stands they took during the Tienanmen related democracy demonstrations and aftermath.
Certainly all churches are flawed as are all church members. Christ still has a remnant. And, the Bible speaks of a throng no man can number. I get more eager for that day--day by day.