...Mormons’ authority is [the] Book of Mormon, [while] us “born againers’” main
authority is God’s word, the Bible.
This is why people who want to know about religions should go to people who are members of those religions and not self-styled experts in other sects.
In this case, the authority of the Church of Jesus Christ of Latter-day Saints does not rest in the Book of Mormon. Books, including the Bible, do not convey authority. No man has ever received even a scintilla of divine authority from a book. Books convey information and intelligence, but not authority—and I challenge anyone to show me otherwise.
Another problem is that the Bible is not complete. There are scores of questions it doesn’t answer. For example: 1) how is baptism performed? 2) who is authorized to perform it? 3) is it still necessary to bestow the gift of the Holy Spirit by the laying on of hands? 4) if so, who is authorized to perform it and what words are said? 5) what are the duties of the various officers? 6) what does a bishop do? 7) what does an elder do? 8) can one elder or bishop ordain another elder or bishop, respectively? 9) who can speak for the entire church? 10) how does the church determine what is scripture? (The early church always had an open canon...in fact, there’s never been a time in the history of the church that the canon has been closed.)
These are just ten questions I came up with off the top of my head. I could easily write another ten, and then another. The view that the Bible is the total and complete Word of God is a very narrow view, and we Mormons don’t apologize for accepting other books of scripture such as the Book of Mormon and Doctrine & Covenants. Both were written by prophets under the inspiration of the Spirit of God or direct visitations by angelic beings in fulfillment of biblical prophecy. What then? If Elijah appears in a temple and conveys the keys of authority for the binding of families forever, wouldn’t that event, if true, be worthy of being recorded in scripture? That can’t happen with a closed canon. Oh, and one more question, 11) if the Lord has a communication for mankind, who could he possibly call on who could authoritatively deliver the message? Would the Methodists listen to a Baptist? Would the Southern Baptist Convention consider the word of a Presbyterian? This business about the “body of Christ” being a collection of competitive religions is a manmade doctrine and is a crock. Certainly, the only man a Jehovah's Witness might listen to would be a member of the Governing Body, and they say they don’t receive revelation...except for “new light.”
If the early church needed to glean authority from the scriptures, what scriptures did the early church use to gain their authority? I see these paranormal shows on TV and the Christian pastor walking around a haunted house with his worn Bible and reading from it. More often than not it doesn’t do any good, and how could it? Satan knew the scriptures as well as Jesus and used them to tempt him.