The Facts on the Mormon Church (Harvest House, 1991) pp. 42-43
What is the true basis of eternal life and how is it found?
Biblically, eternal life with God and Christ is a reality that begins the moment a person receives the true Jesus Christ as his or her personal Savior from sin. “Yet to all who received him, to those who believed in his name, he gave the right to become children of God” (John 1:12 NIV).
It is absolutely impossible for anyone to inherit eternal life based on his or her own good works and personal righteousness because no one can ever be good enough to satisfy God’s perfect standards. According to the Bible, such persons will only inherit eternal judgment (Matthew 25:46; John 8:24; Galatians 3:21, 24).
But if anyone believes on the true Jesus Christ and trusts in Him alone for salvation, and not in their personal works of righteousness,* Jesus promises them eternal life: “Truly, truly, I say to you, he who believes has eternal life” (John 6:47). In John 17:3 Jesus also taught, “This is eternal life, that they may know Thee, the only true God, and Jesus Christ whom Thou has sent.”
Jesus said that no man can serve two masters (Matthew 6:24). The practicing Mormon must choose between coming to know and serving the true Jesus Christ or continuing to serve Joseph Smith and the Mormon Church. One simply cannot serve both.
*For full documentation, please see The Facts on The Mormon Church.