@gondwanalon
I assume your issue is with this part: ”...they are the principal ancestors of the American Indians.”
First of all, I guess it depends whether you consider the introduction (which was added to the beginning in 1981, if I remember correctly) to be a separate commentary/summary of the Book of Mormon, or actually part of the Book of Mormon.
For the sake of argument, let’s say that it should be considered part of the Book of Mormon. Now let’s consider what the word “principal” means. Looking at a couple of dictionaries it could mean “most important”. So I read it as “they are the most important ancestors of the American Indians,” meaning that their accounts, stories, etc. are the most important of the ancestors of the Native Americans.
Interestingly enough, there were mormon historians, scholars, etc. who argued, since it was added, that that part of the introduction was incorrect/misleading and it was changed in 2006 to read ”... they are among the ancestors of the American Indians.”
Again, the Book of Mormon is mainly about a group of people who came to the Americas, split in to two groups who fought with each other off and on, until, in the end, they had a major war where one side was wiped out completely, and the other side was greatly reduced in number. The survivors were probably absorbed into one of the other groups. Fast forward 1400+ years and the Smithsonian doesn’t find some genetic code, to which I shrug my shoulders and agree that I wouldn’t expect them to.
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Hmm, this is getting long and I didn’t mean to get so off-topic (off-question?). @gondwanalon, send me a PM if you want to continue this discussion.
/me let’s people get back to their regularly scheduled question