Um, hope it's fine if I add my two clips here. This is mostly based on my beliefs in the LDS church, and not all of it is church cannon but instead my personal opinions based on my upbringing. I do plan to see if any resources were posted in this thread for the sake of understanding.
I'm gonna say this again just to avoid any accidental problems (sorry, but I'm paranoid). My beliefs, and I'm not attacking anyone, just adding to this discussion.
I believe that the Book of Mormon comes from the descendents of Joseph, the grandson of the prophet Abraham. I believe that there is a verse at the end of Genesis that says this will happen.
Religion is basically impossible to prove. Only prophets who have seen God can say "I know He exists", and they're all dead (or immortal but not publicly preaching that afaik *cough 3 Nephites and, I think, Paul cough*) I have my beliefs, but I can't prove it because the Bible is a shaky resource in scenarios like these, other denominations say the BOM is a lie by Joseph Smith, and my personal beliefs are based on emotional experiences instead of fact.
One more thing I want to say on this sub-topic, non doctrine belief by the way, God created man using evolution, then stuff changed. I cite physical differences between Europe and Asia, as well as cancer, poor eyesight, disabilities, allergies, and things in that umbrella. It is not definitive, but I believe that God uses natural processes to create miracles.
I just want to thank people here for the new insights. I don't get input from this viewpoint at all, and it is an interesting question.