3. God needs laborers for His harvest.
Jesus saw the crowds of people who were like sheep without a shepherd. His response was for the disciples to pray for more harvesters (Matthew 9:35-38). Our God is a sending God whose harvesters gather His people together to send them into other places to gather and scatter. God sent His Son Jesus into the world to save and redeem it from the curse placed upon all mankind. Jesus sent the church as laborers to make disciples of people of all nations. Where this is practiced and adhered as the battle cry of Jesus, more churches will be necessary to handle the births of new believers.
4. Christ, the Head of the Church, needs a body.
It seems heretical to say that Christ needs anything. But Christ chose to use His spiritual body as the means to represent Himself to the world. The local church is a representative of Christ’s body in that community. To call a church’s mission “incarnational” (as some do) is somewhat belittling to the incarnation of God as Jesus. A better term may be representational (as Andreas Kostenberger said). This simply means that the church embodies the Spirit, words and activities of Jesus Christ, especially amongst those in the community. The incarnation of God was fully accomplished by sending Jesus in a human body to live among humans in order to seek and to be able to save them from their sins. The new church plant seeks to become Christ’s representative in a specific local community or region. A church does not exist just for its own interests; it exists for the greater good of the community in which it resides — and that to bring glory to God. To properly represent Christ, a church embeds itself into the community with the clear message of hope through the One who can save them from their sins (1 Corinthians 9:19-23).