There are godly, Bible-believing, Christ-exalting, God-centered followers of Jesus who fail to see the dreadfulness of not being baptized as a believer. And there are godly, Bible-believing, Christ-exalting, God-centered followers of Jesus who fail to see the dreadfulness of excluding such people from church membership.Now, Dr. Piper's concluding benediction aside (which I think is the right prayer to make in this case), the problem is not intransigence on the part of the credobaptists -- because we want these people of good faith, these people who have a faith we credit as good and from God and as a miracle of the Holy Spirit, to join us as a church. The question is simply not whether we call them to join us: please, in the name of the savior, join us!
But join us by being baptized. You say you were baptized as an infant, but the New Testament says that baptism is for believers and not merely those whom we hope will someday be believers. Baptism is a plea for a good conscience before God.
I want anyone who has good faith to join with my local church. I want none to be excluded. What I don't want is to do that apart from the obedience of faith, either on my part or theirs.
I honor Dr. Piper's zeal to be visibly in union with other believers. That is a goal which must be unity in truth or else it is a superficial and false unity.