I appreciate the thoughts Kish, you are always provoking in your commentary, but really, that argument (That it is either all true or all false) was what the original Church was founded upon. Joseph Smith taught that, "I never told you I was perfect, but there are NO ERRORS in the revelations that I have taught."
In the course of the work of translation, we ascertained that three special witnesses1 were to be provided by the Lord, to whom He would grant that they should see the plates from which this work (the Book of Mormon) should be translated; and that these witnesses should bear record of the same, as will be found recorded, Book of Mormon, page 581 [Book of Ether, chapter 5, verses 2, 3 and 4, p. 487, edition 1920], also page 86 [II Nephi, chapter 11, verse 3, p. 73, edition 1920].
"And behold, ye may be privileged that ye may show the plates unto those who shall assist to bring forth this work; and unto three shall they be shown by the power of God; wherefore they shall know of a surety that these things are true. History of the Church, Vol. 1, p.53
We say that God is true; that the Constitution of the United States is true; that the Bible is true; that the Book of Mormon is true; that the Book of Covenants is true; that Christ is true; that the ministering angels sent forth from God are true, and that we know that we have an house not made with hands eternal in the heavens, whose builder and maker is God; a consolation which our oppressors cannot [p.305] feel, when fortune, or fate, shall lay its iron hand on them as it has on us. Now, we ask, what is many Remember, brethren. that time and chance happen to all men. Joseph Smith, History of the Church, Vol. 3, p.305
This interesting tidbit is from 1843, at a Conference in New York City attended by many of the 12:
In the afternoon, after Elder John E. Page had addressed the meeting, Elder George T. Leach was appointed to preside over the Church in New York, in place of Elder L. R. Foster, who was about to remove to Nauvoo. After which several children were blessed, and the meeting adjourned until evening; at which time Elder Orson Pratt addressed the people in an edifying manner concerning the Book of Mormon, its history. what it was, &c.; that it was a history of nearly one-half of the globe, and the people that inhabited it; that it gave a history and names of cities that have been of late discovered by Catherwood and Stephens; that it spoke or the establishing of our government; and what is more highly interesting, it reveals its final fate and destiny; so that, by reading the Book of Mormon, you can clearly see what will befall this nation, and what will be its final end.4
[p.553] In that book you will find recorded the pure principles of the gospel of Jesus Christ, as taught by Himself on the continent of America, so plain that no two persons could disagree as to the points of doctrine set forth. He then bore testimony of the truth of Joseph Smith being a prophet of God, and that the Book of Mormon was true; also that the Church of the Latter-day Saints was the Church of God. He spoke about two hours; and after he closed five children were blessed, and then the people were dismissed. Joseph Smith, History of the Church, Vol. 5, p.553
Here is BH Roberts note to that,
BH Roberts wrote:4. This statement of Elder Orson Pratt's views is doubtless faulty. The Book of Mormon does not predict what will befall our nation, the United States, nor "its final end." But it contains a conditional prophecy in relation to the two American continents. These continents are a promised land. They are given, according to the Book of Mormon, primarily to the descendants of the Patriarch Joseph, son of Jacob, as an inheritance, but the Gentile races are also given an inheritance in them with the descendants of Joseph. The whole land, however, is dedicated to righteousness and liberty and the people who possess it, whether of the house of Israel or Gentile must be a righteous people and worship "the God of the land, who is Jesus Christ." In that event God stands pledged to preserve the land and the people thereof, free from bondage of all other nations, and to bless them with very great and peculiar bressings, guaranteeing to them freedom and peaceful possession of the land forever. If the Gentile races shall observe these conditions they and their children are to share in the blessings of the land in connection with the descendants of the Patriarch Joseph. But if they depart from justice, reject righteousness and Jesus Christ, then judgments of destruction decreed in the Book of Mormon, will overtake them until they are wasted away. This is the decree of God respecting the western hemispbere, and is one of the important messages that the Book of Mormon has to deliver to the present generation. See Book of Mormon II Nephi 1: 5-12; also Ether. 1: 42; III Nephi 20: 14-20; III Nephi 20: 27, 28; III Nephi 21: 11-25; also "New Witness for God Vol. III, pp. 314-323. But it will be seen that these prophecies are conditional, and therefore cannot be held to be predictions of what the final end of our nation, the United States and other nations of the American continents, will be, since it yet remains to be demonstrated whether they will abide or violate the conditions upon which they may possess the continents perpetually.
Yet, in 1838, Parley P. Pratt taught the same thing,
Parley P. Pratt wrote: See also, page 526, where a sign is given, and the time clearly set for the restoration and gathering of Israel from their long dispersion, namely, the coming forth of the Book of Mormon, should be the sign; and in the day this work should come forth, should this great event commence among all nations. Also, p. 527, where all who will not hearken to the Book of Mormon, shall be cut off from among the people; and that too, in the day it comes forth to the Gentiles and is rejected by them. And not only does this page set the time for the overthrow of our government and all other Gentile governments on the American continent, but the way and means of this utter destruction are clearly foretold, namely, the remnant of Jacob will go through among the Gentiles and tear them in pieces, like a lion among the flocks of sheep. Their hand shall be lifted up upon their adversaries, and all their enemies shall be cut off. This destruction includes an utter overthrow, and desolation of all our Cities, Forts, and Strong Holds—an entire annihilation of our race, except such as embrace the Covenant, and are numbered with Israel.
Now, Mr. Sunderland, you have something definite and tangible, the time, the manner, the means, the names, the dates; and I will state as a prophesy, that there will not be an unbelieving Gentile upon this continent 50 years hence; and if they are not greatly scourged, and in a great measure overthrown, within five or ten years from this date, then the Book of Mormon will have proved itself false. And furthermore, as Mr. La Roy Sunderland has lied concerning the truth of Heaven, the fullness of the Gospel, and has blasphemed against the word of God, except he speedily repent, and acknowledge his lying and wickedness, and obey the message of eternal truth, which God has sent for the salvation of his people. God will smite him dumb, that he can no longer speak great swelling words against the Lord; and a trembling shall seize his nerves, that he shall not be able to write; and Zion’s Watchman shall cease to be published abroad, and its lies shall no longer deceive the public; and he will wander a vagabond on the earth, until sudden destruction shall overtake him; and if Mr. La Roy Sunderland enquires, when shall these things be? I reply, it is nigh thee—even at thy doors; and I say this in the name of Jesus Christ. Amen (Mormonism Unveiled, 1838, pages 13-14)
Roberts backpedaling is typical of how the early apostles (including Joseph Smith) were handled later, when their prophecies and teachings were proven to be false as borne out by historical events. This led us to where we are today, a divided Apologetic community with some sticking to the original tenets of the faith and others abandoning that in favor of something that doesn't make it look like a complete fraud.