The New Testament knows little of an individualized faith separated from Christian community. If we speak of evangelism, we must also speak of the church. In the book of Acts, we see God himself "adding" new believers to the church (Acts 2:41, 47; 5:14). One cannot read Acts without noting that nearly everywhere the gospel was preached, communities of believers are formed. Evangelism led to the establishment of churches under a local spiritual leadership and interrelated with other churches. To belong to Christ is also to belong to Christ's people (I Cor 12:13).
Craig Ott, Professor Trinity Evangelical Divinity School, Encountering Theology of Mission, p. 118