The Savior was clear and distinct about his doctrine. The words contained in verses 33 and 34 are so pure and fundamental that they must have been part of the plan of salvation as scripted in the councils of heaven. It is as if these words were lifted off those holy pages and delivered directly to the Nephites, for the Lord admits that it is the doctrine which the Father hath given unto me (v. 32).
After one accepts that God exists, the next most fundamental doctrine is that all men must repent, believe in Christ, and be baptized in order to be saved, whereas those who do not believe and are not baptized, shall be damned. If it sounds too simple, it's not. If it sounds to harsh, it's not. It is the truth, and the key to salvation. Therefore, the role of the latter-day servant is to limit the number of souls, living or dead, who will be damned because of their unbelief and unwillingness to be baptized.