Nine Marks has an interesting article on why you should become a church member and even when you have an excuse for not joining one church you must look for another and BECOME A COMMITTED CHURCH MEMBER. Check this out….
REASONS TO JOIN THE CHURCH
These more deliberate conversations veer back and forth between the biblical and the practical. Typically, I generally encourage a person to join the church
# For the sake of the pastors. It lets the pastors know who you are, and makes them responsible for you (see Acts 20:28; Heb. 13:17).
# For the sake of obedience to Jesus. Jesus did not give you the keys of the kingdom for binding and loosing. He gave the keys to the apostolic local church (Matt. 16:13-20; 18:15-20). You don’t have the authority to baptize yourself or feed yourself the Lord’s Supper. It requires a church to affirm your profession of faith, which is what membership is at its very heart (see Acts 2:38).
# For the sake of other believers. Joining makes you responsible for one local congregation, and they for you. You now own or have a share in their discipleship to Christ. That is, you are now responsible for their growth and professions of faith, insofar as you are responsible for the church’s faithful gospel preaching (Gal. 1) and that individual’s discipline (Matt. 18:15-20; 1 Cor. 5).