Unity?!?!

Is there a necessity of church unity today? I do not refer to the unity of believers in specific church setting, such as a baptist, methodist, presbyterian. etc. I am referring specifically to the unity of believers as a whole in the body of Christ. Why do I bring this up? For a couple of reasons, It seems within the context of Christianity we have all these quarrels and other nonsensical debates that ramble on yet do not edify anyone, but rather serve to create strife in the church community. Some examples off the top of my head are churches that refuse to associate with other churches on the basis of the gifts of the Holy Spirit. Here's a news flash I think if God wanted to do away with the gifts he would have put it in the Word. As far as the other side, there are rules to which gifts are to be used.
Another example is constant haggling over Arminianism vs. Calvinism, I personally think this issue has been one major issues that has caused much of the disunity among believers.
My point in bringing this up, is that these are second hand issues that have no place in competing with the main purpose of glorifying God, which is our sole purpose. When it comes right down to the brass tacks, should make a difference if John MacArthur were to speak at Mars Hill in Seattle, or does it matter if Driscoll were to speak at MacArthur's church? Do they not believe in the same Jesus. The same Jesus who calls us to repentance.
While it is fun to discuss these second hand issues in civil discourse. Once the gloves come off and you start distancing yourself from fellow believers, because they don't think like you think. You have not only done a disservice to other Christians, you have caused unbelievers to view us as a bunch of jackasses. All because you're "brilliant" application of the Scripture doesn't jive with the other "heathen" Christians.