The story of the origin of Mormonism is strangely similar to the supposed origin of Islam, only even more bizarre. A farmer supposedly discovers golden tablets written in a strange language on his farm. Of course this farmer is illiterate, so what does he do? He prays to God and God graciously grants him the ability, promised in a part of the New Testament that was absent from the earliest copies of Mark and hence was a latter-day addition, to speak - or rather read - in tongues. He then proceeds to dictate the contents of the tablets to a literate friend. The tablets apparently contain an entire set of new books to add to the Bible! They detail the supposed travels of a ``lost tribe of Israel'' that came to the new world sometime in the ballpark of 580 BCE, which puts it square on the period that the Babylonian captivity was ending. The chaos of this period is somehow unrecorded in the Book of Mormon.
The amazing thing about the Book of Mormon is how anybody could have ever taken it seriously. The writing is terrible. It is salted with ``Biblical'' sounding phrases such as ``And it came to pass'' and ``exceedingly'' as in ``exceedingly glad'' to the point where it is positively embarrassing. It is chock full of anachronisms - things like steel swords (in the New World, which didn't even have iron implements when Columbus arrived), compasses (used by Nephi while sailing to the New World), Old World animals and plants carried to the New World ``where they flourished'' - but not for long, as there was no trace of them when Columbus arrived. It quotes long passages from the New Testament in spite of the fact that it wouldn't be written for six or seven hundred years yet. It is openly racist - the good guys in it are always white skinned, the bad guys are always dark skinned.
The Book of Mormon is in fact the first piece of science fiction written in the New World! It is a pure religious fantasy, from cover to cover, without a lick of truth in it, the whole-cloth invention of the author. It should come with the standard declaimer about fiction in the front - that its contents bear no resemblance to any person that has ever lived or events that ever occurred.
None of which matters to anyone raised Mormon. Even the failure to find Semetic DNA in any of the New World populations doesn't daunt believers, as they have a social system of ostracization and punishment second only to that of Islam with which to prevent apostasy. They do suffer from the disadvantage of being located in the United States, which takes a dim view of them taking any overt steps that violate freedom of religion, but all of the steps that can be taken short of actual violence are generally employed. As is the rule more than the exception with the Abrahamic religions, it is very hard on women, permitting polygyny (but naturally, not polyandry), concentrating church power among the men.
As far as our purposes here are concerned, none of this really matters. As an Abrahamic construction, it inherits and perpetuates the dualistic Abrahamic God, perpetuates the extortive hellfire meme in a way that powerfully echoes the words of Muhammed. This means that the God it describes and its creation mythology are absolutely contradicted by the theorem proven above.