Hi Tom,
I thought it necessary to give a couple of responses to your reasoning.
I hope I am not causing further division but rather greater unity in that we understand each other as brethren and the scriptural reasons (though they may be off base) why we believe as we do.
Too often many of us take the explanations of our differences personally but I see that is not happening here as evidenced by the lack of ad hominems.
Feel free to call the whole number of the saved Christianity, or the kingdom, or Christendom. But it's not the Church. It's invisible because it doesn't exist.
It's called "invisible" because it is seen only by God. Only God knows the wheat from the tares sown among us in the world and in our local churches.
We all agree on the purpose of local congregations. What is the purpose of the Universal, Invisible Church? Besides being invisible.
To glorify God: (While the language of the following passage is allegorical it is "universal") and to offer "spiritual sacrifices" in the second passage.
John 15:1 I am the true vine, and my Father is the husbandman.
2 Every branch in me that beareth not fruit he taketh away: and every branch that beareth fruit, he purgeth it, that it may bring forth more fruit.
3 Now ye are clean through the word which I have spoken unto you.
4 Abide in me, and I in you. As the branch cannot bear fruit of itself, except it abide in the vine; no more can ye, except ye abide in me.
5 I am the vine, ye are the branches: He that abideth in me, and I in him, the same bringeth forth much fruit: for without me ye can do nothing.
6 If a man abide not in me, he is cast forth as a branch, and is withered; and men gather them, and cast them into the fire, and they are burned.
7 If ye abide in me, and my words abide in you, ye shall ask what ye will, and it shall be done unto you.
8 Herein is my Father glorified, that ye bear much fruit; so shall ye be my disciples.
Again, I wish there were some other terminology than "universal" and "invisible" since there is no scriptural reference as such but only allegorical/metaphoric, however neither is "local church" as a phrase found in the Scripture but as an a priori or self evident concept as is the "invisible".
There are liberal, cultic, 7th day, Catholic, etc and even probably many "good local churches" which have no regenerate individuals or only 1 or a small handful. Are each of these the Body of Christ?
The concept of the "universal" church is the collective af all those born-again individuals to date scripturally called "the Church of the Firstborn".
"universal" and/or "invisible" is the name given to it at least for convenience sake as is the "local church".
Tom, you mentioned the future as applicable to those allegories and metaphors concerning the concept of the "universal" or "invisible" church and this is true but it is because they are yet being built (stone by living stone) as hopefully is happening in every "local" church.
1 Peter 2
(addressed to believers in Pontus, Galatia, Cappadocia, Asia, and Bithynia and no specific "local church").
2 As newborn babes, desire the sincere milk of the word, that ye may grow thereby:
3 If so be ye have tasted that the Lord is gracious.
4 To whom coming, as unto a living stone, disallowed indeed of men, but chosen of God, and precious,
5 Ye also, as lively stones, are built up a spiritual house, an holy priesthood, to offer up spiritual sacrifices, acceptable to God by Jesus Christ.
6 Wherefore also it is contained in the scripture, Behold, I lay in Sion a chief corner stone, elect, precious: and he that believeth on him shall not be confounded.
7 Unto you therefore which believe he is precious: but unto them which be disobedient, the stone which the builders disallowed, the same is made the head of the corner,
8 And a stone of stumbling, and a rock of offence, even to them which stumble at the word, being disobedient: whereunto also they were appointed.
9 But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light:
10 Which in time past were not a people, but are now the people of God: which had not obtained mercy, but now have obtained mercy.
Again, this does not minimize the importance of a Bible centered local church where at least most if not all the members are regenerate.
HankD