If the church is a building, then we must be bricks in it; if the church is a body, then we are its members; if the church is a household of faith, then we are part of that household. Sheep are in a flock, and branches on a vine. Biblically, if we are Christians we must be members of a church. This membership is not simply the record of a statement we once made or of affection toward a familiar place. It must be the reflection of a living commitment or it is worthless.
Mark Dever