We believe church membership is vital to the Christian life as a visible and tangible expression of a believer’s grafting into the True Vine, Jesus (John 15:1–11), and incorporation into his body, the church (Ephesians 5:30; Colossians 1:18; 1 Corinthians 12:12–27).
When a person becomes a Christian, he doesn’t just join a local church because it’s a good habit for growing in spiritual maturity. He joins a local church because it’s the expression of what Christ has made him—a member of the body of Christ. Being united to Christ means being united to every Christian. But that universal union must be given a living, breathing existence in the local church.
-Mark Dever, Capital Hill Baptist Church