A really good article from Crossway (publishers of the ESV Bible) – Are you a healthy church member?
When we talk about being members of a church, we’re not at all borrowing from the idea of membership in a rotary club, Sam’s Club, or bridge club. We’re actually using a term that’s distinctively Christian or Christological. It comes from the image that Paul uses of the church being the body of Christ, and we are members of that body. A healthy church member treasures that biblical reality.