One area of the Book of Mormon that does bother some is what they see as anachronistic doctrine; that the Book of Mormon has Christian doctrine prior to the coming of Christ; that it has seemingly New Testament doctrines appearing centuries before Jesus arrives, and it seems to be representing a form of Christianity existing in the New World where there doesn't seem to be much evidence of that archaeologically. Christianity is invisible in the New World prior to the coming of Columbus, and so those things seem like clear anachronisms to people looking at it in that way.