Examine internal contradictions - google anachronisms in the book of mormon. The reformed hieroglyphics 300 years before Jesus using the words "Jesus" and "Christ" (both based upon greek). or French "au due".
Perhaps the 4000+ changes to the text of the book of mormon, said by smith to be the most perfect book in the world - corrections all done without benefit of the metal plates.
And finally, research HOW the bom was translated. True history records smith with his face in a hat looking at a smooth pebble (seer stone), no special glasses, etc. Check out www.mormonthink.com for more background.
I just skimmed through all of the above and can say - been there, done that. My input deals with the linguistics.
Language tends to be the last cultural item lost in assimilation. One can pretty much follow the migration patterns of humans using comparative linguistics.
For example, the Thai language is spoken by Thais, Laos, and ethnic minorities in both Vietnam and China. In China’s Yunnan province, the Dai minority speak Thai in such a way that Thais visiting there can actually carry on a conversation with these Dai people. Relationships can be linguistically followed and tracked as linguists have done with the Indo-European languages and have even replicated what appears to be the mother of all Indo European languages or proto-language by using the common words in a host of European languages. In fact, a tree of these languages has been developed and one can easily see the connections. (http://www.danshort.com/ie/) between the languages.
There is no connection whatsoever with American Indian languages and any Middle Eastern or even Indo European languages. The concept that somehow these indigenous North American languages are related to the Mormon “Lamanites” is certifiably absurd.
As I stated earlier: been there, done that.
I hope I didn’t need a sarcasm tag on my last post?