Ensign, July 1973, pg. 108; “When the Savior established his church during his mortal ministry, and as it was further developed by the twelve apostles of that day, one important fact became conspicuously clear, which is: that salvation comes through the Church… It does not come through any separate organization or splinter group nor to any private party as an individual. It comes only through the Church itself as the Lord established it.
It was the Church that was organized for the perfecting of the Saints.
It was the Church that was given for the work of the ministry.
It was the Church that was provided to edify the body of Christ, as Paul explained to the Ephesians.
Therefore it was made clearly manifest that salvation is in the Church, and of the Church, and is obtained only through the Church.” – Mark E. Petersen
Ephesians 4:14-15; “That we henceforth be no more children, tossed to and fro, and carried about with every wind of doctrine, by the sleight of men, and cunning craftiness, whereby they lie in wait to deceive; 15 But speaking the truth in love, may grow up into him in all things, which is the head, even Christ.”
This is a small part of a 6 page diatribe on the importance of being a Mormon.