As Christians we do a great diservice to our Lord if we just go around and make it our mission to find fault with ever denomination.
Yes, I agree wholeheartedly that we are to expose the truth - but sometimes it goes too far and can become very nasty. A Christian's calling is not to be nasty or overly judgemental. We are to judge with the Wisdom of God through Holy Spirit Discernment and according to His Word.
According to God's Word Jesus Christ is returning for a Church without spot or wrinkle - how can a divided church be without spot and wrinkle?
I think we should try to put our small differences aside, concentrate that Jesus Christ is our commonalty, and all work better together according to God's Word.