Churches do not make disciples of Jesus, disciples do. From the beginning kingdom multiplication came by disciples making disciples, not churches starting churches or small groups starting small groups.
(This is not to say that disciples cannot be made in churches or in small groups, but it is the disciples in those churches or small groups that are actually making the disciples.)
The books of Matthew, Mark, Luke, and John give us four extensive accounts of Jesus training his disciples. Nowhere in that training do we find “how to start a church” or “multiplication through growing small groups.” Jesus sends his eleven men into the world to make disciples following the pattern they had experienced with Jesus the previous three years.
Jesus had used farming to teach the disciples how kingdom multiplication works. The evidence of a plant’s maturity is its ability to produce fruit. The mark of spiritual maturity is a disciple’s ability to produce another disciple. One tomato seed will produce hundreds of tomatoes and one apple seed will produce generations of apples. It is unnatural for any life form not to reproduce itself and so it is spiritually unnatural for a disciple of Jesus to not reproduce himself.
There are very few that can lead a small group and even fewer that can start a church, but everyone can make disciples of Jesus. On the most primary level, parents and grandparents making disciples of their own children and grandchildren.