Is Numerical Church Growth a Biblical Mandate?
Churches don’t necessarily have the mandate to grow but they do have a mandate to deploy all their resources to advance the message of the good news of Jesus Christ. Churches must utilize all that God has given them to make disciples, it’s why they exist. It’s a matter of stewardship.
Churches are not unfaithful if the chairs are not filled but they are unfaithful if those who fill the chairs are not working at telling the broken world about Jesus in word and deed. So what churches must evaluate is not merely if they are reaching the lost community around them but if they are even intentionally thinking in that way. Jesus came to seek and to save the lost and He has called us to carry out His mission of making disciples.
Winston Churchhill used to give out commands labeled “Action This Day.” These tasks were to be done with urgency and intentionality. How much more our Lord’s command?! It is labeled “Action This Day!” It is high priority.
So, is numerical church growth a biblical mandate? Not exactly. After all, it’s the Spirit who gives life. Yet, intentional discipleship and ministry of the Word very often leads to numerical church growth. So, we must work to intentionally love and reach people with the good news of Jesus but not merely for numerical church growth.
The question churches must ask is not simply “how can we grow this church?” but “how can we best deploy all our resources for the furtherance of the gospel and the growth of God’s Kingdom?” So, as we strategize about our church we must not forget about the Church.
 I have found Jeff Christopherson’s book Kingdom First: Starting Churches that Shape Movements very helpful on this subject.