At FBC Webb City we strive to take church membership serious and make it meaningful. We believe official membership is a biblical concept. In the New Testament there are instances where letters were sent with a Christian from one church family to carry with them to another city's church family. These letters verified to the new church family that the traveler was a genuine convert to Christ and a committed follower of the way of Christ. Paul also makes mention of a Christian being among the "number" of a church body. See Acts 18:27; Colossians 4:12
Furthermore, letters titled Ephesians, Galatians, Corinthians, etc. These were are clearly applicable to the church worldwide, however they were original written to a specific local church in that city. This implies that the church knew and understood who belonged to their local congregation. For example, one would be clear if they belonged to the church of Ephesus, or Corinth, etc.
Finally, Pastors (or Elders/Overseers) are spoken of in the New Testament as being over specific congregations. If a Pastor/Elder is held accountable for how they shepherd the flock God has placed them over, this implies there was a clear way of knowing who belonged to the flock. For example, a Pastor in the church of Ephesus would not be accountable for shepherding also the people in the Church of Rome. The implication is each Pastor has a way of determining who belongs to their church. Who they are held accountable for to pastor and teach. This all implies some system of church membership. See 1 Thessalonians 5:12-13; 1 Timothy 5:17; 1 Peter 5:1-14.
With this biblical model set before us, we also strive to define membership for our church. This helps our pastors know whom they are directly accountable for to pastor among. This also helps the members have a meaningful church family to be in fellowship with and share life with.