Which means, of course, that this basic contradiction disproves the supposed eternal truthfulenss of the fraudlulent Mormon faith.

That simple reality check is provided by Richard Packham in his article, “Major Contradictions in Mormonism."

He writes:

“Why are contradictions important?

“Contradictions are a mark of falseness. If two statements contradict each other, then one of them must be false. If both statements come from the same person, then the suspicion must arise that the person is lying (or at least grossly mistaken) in one of them, or perhaps both. If both of the contradictory statements are supposed to be from God, or from God's spokesman (a prophet or a scripture) then we are justified in considering this supposed spokesman to be fraudulent, since God is not supposed to lie or to make contradictory statements.

"'For I am the Lord, I change not; . . .' - Malachi 3:6 "God is not a man, that he should lie; . . . hath he spoken, and shall he not make it good?"' Num 23:19

"' . . . with [God] is no variableness, neither shadow of turning.' - James 1:17 (see also BoM Morm 9:9, Mosiah 2:22, Alma 7:20)

“Mormon leaders insist that there are no contradictions in Mormonism. Joseph Fielding Smith, the tenth president of the church, said:

“'If his [Joseph Smith's] claims and declarations were built upon fraud and deceit, there would appear many errors and contradictions, which would be easy to detect.' - Doctrines of Salvation 1:188-189"
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Packham goes on to note the glaring LDS doctrinal contradiction between forbidding the entry into Mormon heaven of those who did not repent of their sins before they died, and the Mormon practice of baptizing for the dead, say, the likes of that unrepentant Adolf Hitler:

"What happens to people who die before having had a chance to hear the gospel?

"D&C 137:7-8 says they will go to the celestial kingdom. BUT: D&C 76:71-78 says they will go only to the terrestrial kingdom (a lower kingdom than the celestial). BUT:

"D&C 128 and 138 outline the Mormon 'work for the dead,' one of the principal purposes of the Mormon temples, to enable all the dead who repent (after death) to attain the celestial kingdom. BUT: BoM Alma 34:32-35 says that those who do not repent before death are eternally lost: ' . . . that same spirit which doth possess your bodies at the time that ye go out of this life, that same spirit will have power to possess your body in that eternal world . . . ye have become subjected to the spirit of the devil, and he doth seal you his . . . and the devil hath all power over you; and this is the final state of the wicked.' (See also 2 Ne 9:38 and Mosiah 2:36-39)

“In spite of this clear language, Mormons have devoted much effort to 'doing temple work' for thousands of unsavory historical figures such as Adolf Hitler.”

(Richard Packham, “Major Contradictions in Mormonism (plus some minor ones),” at: http://xmo.lege.net/packham/contra.htm)