What did Mormon say the Lamanites would believe in if they believed in the Bible?

The Book of Mormon

Lay hold upon the gospel of Christ, which shall be set before you, not only in this record but also in the record which shall come unto the Gentiles from the Jews, which record shall come from the Gentiles unto you. For behold, this is written for the intent that ye may believe that; and if ye believe that ye will believe this also. Mormon 7:8-9