The church and Christians are guilty of many sins, but the question is this: has it followed the example of Jesus too closely or betrayed Him in committing these crimes?
By what standard do we judge the sins of the church? By our own? Then that is of no consequence. By the standards of Jesus? Then we admit his ethic is desirable. If so, then why do we not seek to follow him and confess him too?
Besides all this, whether we confess Him or not, we are not blameless ourselves.