"Why can't we just all get along?" How many times have you heard that, especially about church?
It's an important question - and the answer has little to do with tolerating one another. More importantly, the "getting along" is something the Holy Spirit does as we learn what it means to be humble (like Jesus), forgiving (like Jesus), patient (like Jesus) . . . you see the trend here.
True unity is an expression of transformation. Only the Holy Spirit can do that.