The message of Salvation is found in The Most Holy & Sacred Book of Mormon and is supported by the New Testament, although the New Testament lacks the simple instructions regarding baptism and the communion. The assurance of those who place their faith and hope in Jesus; who follow through with the outward ordinance of baptism (after repentance) is confirmed in both New Covenants records and is simple beyond measure and is not about works i.e. church attendance or service.
The Most Holy & Sacred Book of Mormon confirms its simplicity by the following:
19 And behold, I have given you the law and the commandments of my Father, that ye shall believe in me, and that ye shall repent of your sins, and come unto me with a BROKEN HEART and a CONTRITE SPIRIT. Behold, ye have the commandments before you, and the law is fulfilled. (3 Nephi 12)