This is what the LDS teach about the Bible:
24 And the angel of the Lord said unto me: Thou hast beheld that the book[
Bible]proceeded forth from the mouth of a Jew; and when it proceeded forth from the mouth of a Jew it contained the fulness of the gospel of the Lord, of whom the twelve apostles bear record; and they bear record according to the truth which is in the Lamb of God.
25 Wherefore, these things go forth from the Jews in purity unto the Gentiles, according to the truth which is in God.
26 And after they go forth by the hand of the twelve apostles of the Lamb, from the Jews unto the Gentiles, thou seest the formation of that great and abominable church, which is most abominable above all other churches; for behold, they have taken away from the gospel of the Lamb many parts which are plain and most precious; and also many covenants of the Lord have they taken away.
27 And all this have they done that they might pervert the right ways of the Lord, that they might blind the eyes and harden the hearts of the children of men.
28 Wherefore, thou seest that after the book hath gone forth through the hands of the great and abominable church, that there are many plain and precious things taken away from the book, which is the book of the Lamb of God.
29 And after these plain and precious things were taken away it goeth forth unto all the nations of the Gentiles; and after it goeth forth unto all the nations of the Gentiles, yea, even across the many waters which thou hast seen with the Gentiles which have gone forth out of captivity, thou seest—because of the many plain and precious things which have been taken out of the book, which were plain unto the understanding of the children of men, according to the plainness which is in the Lamb of God—
because of these things which are taken away out of the gospel of the Lamb, an exceedingly great many do stumble, yea, insomuch that Satan hath great power over them.
Book of Mormon, 1 Nephi 13
1 Nephi 13
There is an overwhelming lack of understanding in the world in relation to these principles of salvation and exaltation given to prepare mankind for a place in the kingdom of God, and this lack causes many to stumble. There is no excuse on the part of members of the Church, for they have received the necessary revelation directly from the heavens in this Dispensation of the Fulness of Times. The great mission of the Son of God has been revealed in the Book of Mormon and the Doctrine and Covenants more clearly than any other place. Many passages that have been misunderstood, and therefore mistranslated in the Bible, are clarified in these sacred volumes.
Answers to Gospel Questions, compl. Joseph Fielding Smith Jr., 5 vols. (1957-66) 4:57-58
https://bomhandouts.files.wordpress.com/2012/01/09-040907-2nephi-9.pdf
