The book of Mormon is a joke, full of anachronisms and errors. Large portions of it were copied from the King James Bible. In fact, errors that existed in the King James bible of the time were replicated by Joseph Smith, which would be expected if he just made the whole thing up, but hard to explain if it was actually dictated by God.
It claims that American Indians are descended from Semites, but DNA testing proves that they are actually of Asian origin.
It claims that many things existed in meso America, like blacksmithing, chariots and steel swords when none of them were at that time.
It describes animals that were not in the Americas at the time, like cattle, dogs, sheep, goats and elephants.