The Church Working Together

I spent a week at my parent's house in Oklahoma last week. It was a great visit. I went to help them clean their house so they can start rebuilding from the fire back in July. The fire happened the last Friday in July and it damaged most of the front half of the house. It has been unlivable for all these weeks.
It was good to be there working with my mom, dad, sister, brother, sister-in-law, aunt, uncle, cousin, and their church family. I arrived on Thursday and enjoyed the visit on Friday a couple of us carried out the old furniture. Saturday, the church group came and helped clean out all the old carpet, tear down the ceiling, and clean up debris. It was a great time of fellowship and service. It was the body of Christ coming together to serve one of its members. I continue to learn more about what it means to be a part of Christ's church. The congregation they are a part of is a small congregation, but nearly every member was present and working.
The church working together for a common goal accomplished much. In no time, the house was cleaned out and ready for the reconstruction. I began to think of how much could be accomplished if the church would learn to work together in unity. How many more people would know our Lord if we would unite towards a common goal? How would we be different if we loved each other with a genuine love of Christ?
It seems that churches have a history of division more than unity. Sadly, many Christians would rather debate one another than work together to reach those who do not follow Christ. We would rather argue over patterns and names rather than how to reach our neighbor.
The lesson I learned was a simple one - when the church works together things get accomplished. How do I translate that into a practical missiology?