Gospel Doctrine, pg. 137; “The Church of Jesus Christ of Latter-day Saints is no partisan Church. It is not a sect. It is The Church of Jesus Christ of Latter-day Saints. It is the only one today existing in the world that can and does legitimately bear the name of Jesus Christ and his divine authority.”
1 Cor. 15:1-4; “Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; 2 By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. 3 For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; 4 And that he was buried, and that he rose again the third day according to the scriptures.”
I often wonder what my grandparents thought of when they joined the Church and sat through teachings like the one listed above. One side of my family left everyone back in England for Mormonism. Why would you think your entire Christian family was going to hell?