I’m not alarmed at the responses I find here; it’s what I expect. I’m just always turned off by the “one true church” argument. Jesus rejects no one who believes in Him, asks for forgiveness and dedicates their life to Him. Catholic or Protestant, the objective is to become more Christ-like. Simply praying certain prayers or attending a certain denominational church is not salvation. Jesus does not use religion to divide his followers. Only man does that.
I agree with you that we must all be more Christ-like, but the Lord did give many requirements for discipleship. Among them was the Great Commission. The Apostles were commanded to go forth and make disciples of all nations, baptizing them in the name of the Father, Son, and Holy Spirit. He told them that people who hear them, hear Him. He also prayed for unity in a very real, tangible way in His priestly prayer in John. Jesus wanted His followers to be so unified that they would be as the Father and He. There are many more requirements to be a disciple of Christ, as well, named throughout Scripture.
Now, if we look after Christ ascended, to Paul and the Apostles, we see they appointed men that they deemed worthy to lead after them. Paul writes to Timothy and Titus as bishops. Appointing men after them is an issue, as he also gives instructions on selecting a bishop. Bishops were, and are, appointed to carry on the Apostolic commission.
The need for unity in doctrine is seen in Acts 15, in which a decision had to be made on Judaising. Many may have claimed this was a minor issue, that circumcision was required. I mean, why didn’t they just leave the Judaisers alone and let them circumcize and follow the Old Law? They still proclaimed Christ, after all. But the Apostles decided it was not necessary, as works of the Old Testament do not save, but Christ’s sacrifice does.
If we look to the disciples of the Apostles, we again see the importance of bishops espoused, and we also see the requirement for obedience to them has always existed. Clement says that the Corinthian Church must be obedient to their bishops and priests. Ignatius emphasizes this, as well. In fact, obedience and unity are essentially the primary points of both their letters (though Ignatius also focuses on the Incarnation). This was because, immediately after the Apostles (and even during), there was widespread schism caused by the Gnostics. Unity was a primary concern of Jesus Christ, Paul, and the Apostles for a reason: there would be false shepherds, and the faithful had to have a way to discern them.
We can look only a little further (3rd generation of Christians, right after the disciples of the Apostles previously mentioned), to Irenaeus, who speaks of Apostolic succession, and obedience to bishops, as well as the importance of the Church in resolving theological disputes and the primacy of the Roman See. Nothing has changed since the beginning: it all remains in one Church.
You see, my brother in Christ, the Lord Jesus and His apostles, and their disciples after, did want unity in a very visible way. This is the more perfect way: that we be one, as Christ is in the Father and the Father in Him.