There are many serious objections to the claim of Joseph Smith and the LDS church that the Book of Mormon is divinely inspired latter-day scripture supplemental to the Bible. However, none are more significant than the numerous contradictions between Book of Mormon teaching and the Bible.
"Moreover, thou son of man, take thee one stick, and write upon it. . . then take another stick, and write upon it. . . .And join them one to another into one stick; and they shall become one in thine hand."