What is the main thing for the church? To glorify God. How do we glorify God? Preaching the Gospel and bringing disciples into the body of Christ--the local church.
Christ's promise that He will build His church is either a promise or a threat, depending on whether you are "on the train" or "on the tracks."
This is about what is needed to set up a church with an emphasis on our foundation(Christ)
This about examples Paul shows when reaching out to other cities,