We have taken to calling ourselves nondenominational Christians or churches. That is an oxymoron if ever one was heard. You are a Christian or not. And this is the one distinguishing factor between religious folks who call themselves Christians while not fully following the instructions, and against those who call themselves by other names. While it is our desire and prayer that all who call upon the name of Christ would come out of the sad state of affairs that exists in a divided world and seek the truth that comes only through the Word of God and its careful application; we also know that is not widely possible on this side of judgment. However that does not lessen the need to plea that we should all walk according to the instructions. Someone has suggested that perhaps we ought to list ourselves as nonaligned assemblies and churches of Christ due to this sad state of affairs.
The only solution for this problem is for sincere people to step away from the traditions that have been learned and which were given to them to which they have formed allegiance, and to look deeply and with clear vision into the Word of God. With study and reflection those whose thoughts are clear would turn their backs to those traditions and press their way into the assembly established long before there was ever Catholic or Protestant, Pentecostal or World Wide and the like. Rather these penitent followers would seek out the lone assembly of which the founder and single source of authority said, “And the gates of Hell shall not prevail against it.” (Matthew 16:18). And it makes absolutely no difference that you may prefer the word Hades in this passage. Either way you win.
You should know that you cannot “join” this church. You can join any denomination you wish. And as the old preacher posed: “Why not join several? There are good cooks in each, and fine people in everyone; and they all do good things for one another. So why not join a half dozen or so?” But reality creeps in and we know they each would not put up with sharing their members around for any length of time. It is about possession and numbers; and split loyalties don’t sit well whether anyone admits to it or not. And then, the truth is the truth and nothing can prevail against it.
You may have joined one of these kinds of groups — but it won’t do you any good. The church that Christ established does not take applications for membership. The scriptures state that the Lord adds us to His Church when we are obedient to His Gospel – the Good News. (Acts 2:38, 47 and 1 Corinthians 12:13). So the same thing that makes you a Christian also makes you a member of His Kingdom and Assembly: “…the general assembly and church of the Firstborn, whose names are written in heaven…” (Hebrews 12:23)
Why would you want to be either more or less than what is described by the Words of Christ, His Apostles and of His disciples?
But you have come to Mount Zion and to the city of the living God, the heavenly Jerusalem, to an innumerable company of angels, to the general assembly and church of the firstborn who are registered in heaven, to God the Judge of all, to the spirits of just men made perfect, to Jesus the Mediator of the new covenant, and to the blood of sprinkling that speaks better things than that of Abel.
(Hebrews 12:22 – 24)