… the Church of Jesus Christ of Latter-day saints(commonly known as Mormon Church) bases its teaching on three more books besides the Bible?
The church of Jesus Christ of Latter-day Saints recognizes three more books, in addition to the Bible, as bases for judging the belief and the conduct of men:
“the Latter-day Saint accept four volumes as the standards works of the Church. These are the Bible, the Book of Mormon, the Doctrine and Covenants, and the pearl of Great Price. By unanimous vote of a General conference, these four have been declaredto be the established rule or test, by which the belief, the teaching, and the conduct of men must be judged.” (Hyrum M. Smith and Janne M. Sjodahl. Doctrine and Covenants Commentary. P.xi)
ON THE OTHER hand, the apostles taught that man will be judged according to the gospel or Gods words written in the Bible, and anyone who goes beyond or adds to what is written in the gospel will be punished:
“In the day when God will judge the secrets of men by Jesus Christ, according to my gospel.” (Rom. 2:16, New king James Version)
“Now, brothers, I have applied these things to myself and apollos for your benifit, so that youmay learn from us the meaning of the saying, ‘Do not go beyondwhat is written’. ” (I Cor.4:6, New International version)
“For I testify to everyone who hears the words of the prophecy of this book: if anyone addsto these things, God will add to him the plagues that are writen in the book.”(Rev. 22:18, NKjv)