There are those, particularly in our day, who are so disenchanted with the visible church that they steadfastly refuse to join any local church. Such a posture is misguided and involves overt disobedience to the commands of Christ. Though it is possible for a believer to be confused about this for a season, someone who persists in such a posture is, in all probability, not a believer. It is the duty of every Christian to join a visible church.
R.C. Sproul