The gospel of the LDS Church is a set of commands and ordinances that needs to be fulfilled in order to reach exaltation.
“The gospel is our Heavenly Father’s plan of happiness. … In its fulness, the gospel includes all the doctrines, principles, laws, ordinance, and covenants necessary for us to be exalted in the celestial kingdom. The Savior has promised that if we endure to the end, faithfully living the gospel, he will hold us guiltless before the Father at the Final Judgment.” (True to the Faith, p. 76)
The LDS Church teaches that the gospel was restored in its fullness during these latter days through the Prophet Joseph Smith. By following the LDS gospel, a person can find happiness in this mortal life and eternally progress toward happiness in eternal life. Obedience is a hallmark of following the gospel.
Biblical Christianity teaches:
The gospel is the good news of our salvation. It is the specific message of what Jesus has done for our salvation. (1 Cor. 15:1-7) The gospel tells the story of God fulfilling His promise set forth in the Old Testament. It extends an invitation to receive the full benefits of what Christ has already done for us. This includes redemption, justification, and the forgiveness of sins. Faith is the only instrument to receive these blessings.