I can give the suspension of disbelief and benefit of the doubt to a lot of main stream religions. At their core basis they at least make sense in an of themselves. The Mormon religion, however, was 'read' out of a top hat. I'm sorry but the credibility is astoundingly abysmal here. Add all this up along with the Native Americans being Jews, bullshit about the two golden tablet sets after the first copy 'vanished', and the mismatched stories? Don't forget all the male pandering additions and perks inserted to make them OK and morally justified. It's just an obvious load all the way around.
No religion is perfect, and we've seen many alterations and bastardizations to them over time (the 'church' of Jesus probably being the star example here), but Mormonism is by far a completely ridiculous reinvention with obvious ulterior motives in the changes made.
Joseph Smith was nothing but a con artist taking the most popular and widespread religion of his time and place, and bastardizing it to suit his own wants and desires. No one of the Jewish or Christian faith would ever agree that any of the teachings here see eye to eye with this abomination of a religion.