An apologetic response to all of this is pretty easy to give. However, I hesitated to do so, for the simple reason that I think the church is a fraud, and I don't particularly *want* to provide an apologetic response. But then I thought to myself, there may be some on this board that would appreciate it, perhaps because they are still clinging on to a hope in the church. And maybe it might actually help them with some of their family relationships, to smooth things over. I don't know. In any case, here goes... an apologetic response that *somewhat* supports the church. Make of it whatever you want.
To begin the apologetic response, I must first digress and discuss in more detail the 19th century idea of exactly what the "Kingdom" is, and what the "Church" is, from the perspective of the original founders, from which I am a 3rd generation descendant, if anyone cares to know. Yep, that's right... I am talking about my great-grandpa's views here, and he was one of the original founders of the church-- and that's why I know these things.
In those days, the "Kingdom" was thought to be a separate organization from the "Church". I will provide exactly one reference for that, below, although I can produce *many* similar references if I wish to. In DHC 7:382, we have the following:
The Kingdom of God is a separate organization from the Church of God. There may be men acting as officers in the Kingdom of God who will not be members of the Church of Jesus Christ of Latter-day Saints. On this point the Prophet Joseph gave particular instructions before his death, and gave an example, which he asked the younger elders who were present to always remember. It was to the effect that men might be chosen to officiate as members of the Kingdom of God who had no standing in the Church of Jesus Christ of Latter-day Saints. The Kingdom of God when established will not be for the protection of the Church of Jesus Christ of Latter-day Saints alone, but for the protection of all men, whatever their religious views or opinions may be. Under its rule, no one will be permitted to overstep the proper bounds or to interfere with the rights of others. (DHC 7:382)
To make a very long story very short, the "Kingdom" was to be a political organization, based on the economic principle of "United Order", which is a variation of socialism rather than capitalism. It was to have it's own offices and officers (of which the "Council of Fifty" was one of the them, but there was another council above the 50 consisting of 7 members, and yet another above that-- a "king"-- that would hold sway over all of it. Yes, Joseph was sustained as that "King", as was Brigham at a later time. And yes, many of them thought to escape to the Rocky Mountains, away from the United States, in order to establish a new government based on "United Order", and independent of the United States. This is why the charge of "Treason" came from many elements of the United States, and was also the impetus behind Johnstons's Army, sent to the Utah territory in order to put down the Mormon "rebellion", which history now commonly records as the "Utah War". Yes, there are elements of truth to all of those stories.
Anyway, with that brief introduction, here is the apologetic response to D&C 84: 2-5 that I promised, based on the idea of "Kingdom", as described above (and as taught to me by my own father, who, if he was still alive, would be almost 120 years old now):
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Where United Order is, there is the Kingdom.
Where the Kingdom is, there is United Order.
Where the Kingdom and United Order are, there is Zion.
"Zion" and the "City of Zion" are the same thing.* (see footnote)
Where Zion is, there is the New Jerusalem.
The "New Jerusalem" and the "City of the New Jerusalem" are the same thing.
Thus, where United Order is, there you will also find the city of the New Jerusalem.
Thus, D&C 84: 2-5 contains the prophecy that in the last days, United Order will be established, or in other words, the city of the New Jerusalem will be built.
The process of laying the foundation was to begin at the temple lot at the western boundaries of the state of Missouri. That was to mark the beginning of the effort to establish United Order in these last days.
And, obviously, before that effort could begin, the saints had to be gathered to the area, so that they could build it. Thus, "the city New Jerusalem shall be built by the gathering of the saints, beginning at this place, even the place of the temple...".
Now, if the "City of the New Jerusalem" is the Kingdom of God, then different buildings within that city would represent different stewardships within that Kingdom. The building that best describes the Lord's Church would be the "House of the Lord", or the "Temple of the Lord".
So, where verse 4 says "even the place of the temple, which temple shall be reared in this generation", it is referring to the stewardship of the Lord's Church, which is contained within the Lord's Kingdom.
To further illustrate this, when the scriptures say "as for me and my house, we shall serve the Lord", what is the house in that verse? Is it an actual, literal building? Or is it a people, a family? The answer is obvious.
Likewise, what is the "house of the Lord", or the "temple of the Lord"? Is it an actual, literal building, like a temple building or a church house? Or does it instead refer to a specific people, or a specific stewardship within the City of the New Jerusalem (i.e., within the Kingdom)?
The temple spoken of in those verses represents the house of the Lord, which in turn represents the Lord's church within that Kingdom. And the beginning of the building of the Kingdom (i.e., the establishment of "United Order") was starting at that time.
If anyone is curious, the book "Building The City Of God", by Leonard J Arrington, documents over 200 attempts at establishing United Order in those days. It's a rather dry book to read, but I still found it very interesting, and directly supports what I had been taught as a child.
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* footnote: The phrase "Zion and the City of Zion are the same thing" is not technically completely accurate, but it is close enough for the purposes of this article. To be more precise, "Zion" is a condition (of United Order), and the "City of Zion" is the place where that condition exists. The same holds true for any discussion of the "New Jerusalem".