Immortality, salvation, and eternal life are used interchangeably in Christianity and sometimes Mormons also use them interchangeably. However, they are not the same thing. Understanding their true meaning allows us to understand better the commandments and other Christians. But more importantly, understanding the difference between salvation and exaltation is key to understanding the relationship between grace and works.
“Christians have often disputed as to whether what leads the Christian home is good actions, or faith in Christ … it does seem to me like asking which blade in a pair of scissors is most necessary.” – C. S. Lewis, Mere Christianity
Immortality is the state of a resurrected body. Through Jesus Christ, everyone who has ever received a body will be resurrected and given an immortal body. These bodies will be bodies of flesh and bone like the body Jesus Christ had when he was resurrected (Luke 24:19). This gift is given to all, even those who become sons of perdition in this life will be resurrected. (See Guide to the Scriptures, Sons of Perdition)
“The good news is that everyone will be resurrected. All will live again!” – Elder Hartman Rector, Jr.