Have you noticed how Pentecostal/charismatic denominations like to expand by planting their churches in different cities and towns. I believe if different churches in a city had a vision of reaching their city and working together they would be more effective than planting their own brand of church across different towns and cities.
People in the world have a hard time believing that Christianity is the one true religion when there are so many different denominations around each believing they have the truth. There is not unity in the body.
Jesus prayed near the end of his life in John Ch 17 “that they maybe one, just as you, Father, are in me, and I in you, that they may also be in us, so that the world may believe that you have sent me.