In light of the scriptures below, I believe Rev. Ruddell's comment which is quoted below is an astute observation.
(Eph 4:10) He that descended is the same also that ascended up far above all heavens, that he might fill all things.)
(Eph 4:11) And
he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers;
(Eph 4:12)
For the perfecting of the saints, for the work of the ministry, for the edifying of the body of Christ:
(Eph 4:13) Till we all come in the unity of the faith, and of the knowledge of the Son of God, unto a perfect man, unto the measure of the stature of the fulness of Christ:
(Eph 4:14) That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive;
(Eph 4:15) But speaking the truth in love, may grow up into him in all things, which is the head, even Christ:
(Eph 4:16)
From whom the whole body fitly joined together and compacted by that which every joint supplieth, according to the effectual working in the measure of every part, maketh increase of the body unto the edifying of itself in love.
(Heb 13:7)
Remember them which have the rule over you, who have spoken unto you the word of God: whose faith follow, considering the end of their conversation.
(Heb 13:17)
Obey them that have the rule over you, and submit yourselves: for they watch for your souls, as they that must give account, that they may do it with joy, and not with grief: for that is unprofitable for you.
(1Th 5:11) Wherefore comfort yourselves together, and edify one another, even as also ye do.
(1Th 5:12)
And we beseech you, brethren, to know them which labour among you, and are over you in the Lord, and admonish you;
(1Th 5:13) And to esteem them very highly in love for their work's sake.
And be at peace among yourselves.
...In defense of Church membership and vows, note the following Scriptures:
Hebrews 13.7; Remember them which have the rule over you, who have spoken unto you the word of God: whose faith follow, considering the end of their conversation.
Hebrews 13.17; Obey them that have the rule over you, and submit yourselves: for they watch for your souls, as they that must give account, that they may do it with joy, and not with grief: for that is unprofitable for you.
The vows of Church membership have been understood as a necessary implication of the commands in these two Scriptures. There are specific elders/overseers identified in these verses that are not the same for everyone. To which elders do we submit? For which elders are we especially enjoined in these verses to pray for, to obey, to follow, etc.? This is not true of all elders universally, but of those where your membership is held, who by that membership are given a charge to watch over you, pray for you, lead, guide, etc. Apart from membership this command would be so vague as to make obedience difficult if not impossible.
I also appreciate Calvin's thoughts on the importance of the Church in our lives.
The importance of the Church in Sovereign Grace | RPCNA Covenanter How can this work out if we are not members in a Community of neighbors that are fit together by Christ and organized by Him for the work of the ministry.
I would also encourage everyone to examine Articles 27-35 of the Belgic Confession and see the importance which is placed upon being a Member of the Church.
http://www.puritanboard.com/confessions/belgicconfession.htm
Reverend Buchanan's observations are spot on.
Membership, whether we speak of OT or NT aspects of this one religion, is not something that is easily left out of the description of God's people. It is vital to know who is "in" and who isn't. How can the average Christian rightly behave toward those "without," 1Cor.5:12; Col.4:5; 1Ths.4:12, if there's no firm line of demarcation? It isn't simply that we happen know the people we typically see weekly. We know them as we are members of one another, in an identifiable community.