Everything in the Book of Mormon is the "core teaching of Mormonism". Joseph Smith said, "Take away the Book of Mormon and the revelations, and where is our religion? We have none." (HC 2:52)The Book of Mormon lacks the core teachings of Mormonism
That is not true. Like I said, everything taught in the Book of Mormon is the core teachings of the Church. Do you know how many great doctrines are taught in the Book of Mormon? I haven't counted them. But I would guess that they run into hundreds, if not thousands. They are all "core teachings" of the Church.why doesn’t the BOM mention most of LDS teachings?
Firstly, those are not the "core teachings" of the Church. When Joseph Smith was asked what were the fundamental doctrines of the Church, his reply was, "The fundamental principles of our religion are the testimony of the Apostles and Prophets concerning Jesus Christ, that He died, was buried, and rose again the third day, and ascended into heaven; and all other things which pertain to our religion are only appendages to it." (Teachings, p 121). Those are the "core doctrines" of the Church. Secondly, where does it say that every doctrine of the Church should be found in just one book of scripture? That is why we have multiple books, because they are not all supposed to contain everything. The Bible is not all one book either. It is a compilation of many books, written at different times. Our Articles of Faith says, "We believe all that God has revealed, all that he does now reveal, and we believe that He will yet reveal many great and important things pertaining to the Kingdom of God." It is not like your apostate religion which died hundreds of years ago, and has not been receiving any revelations from God since.Like baptism for the dead, celestial marriage, three degrees of glory, that God the Father was a man, plurality of gods, tempory hell, pre-existence of spirits, eternal progression, eternal intelligence, priesthood needed to act for god, plural marriage, polygamy, word of wisdom, secret handshakes etc.