“Have they not read the scriptures, which say ye must take upon you the name of Christ, which is my name? For by this name shall ye be called at the last day; And whoso taketh upon him my name, and endureth to the end, the same shall be saved at the last day.” (3 Nephi 27:5-6)
At baptism, we covenant to take upon ourselves the name of Jesus Christ. Taking the name of Jesus Christ means you “always remember him and keep his commandments which he has given them.” (D&C 20:77; Moro. 4:3.) If we are truly born again, we become His Sons and His Daughters and taking upon His name has even more significance. (Mosiah 27:25)
This is a universal Christian principle, not exclusive to the Church of Jesus Christ of Latter-day Saints. The Apostle Paul wrote “For as many of you as have been baptized into Christ have put on Christ.” (Gal 3:27) Peter reinforced the idea that “neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.” (Acts 4:12)
And while the Church teaches that salvation and exaltation come in and through the Lord’s true church, even the Church of Jesus Christ of Latter-day Saints, one can make the case that taking on the name of Jesus Christ and belonging to the LDS Church can be independent of one another. You will not find that taught in the Church, but certainly, there are many, many non-LDS Christians who are deeply committed to the Savior, follow His example and keep His commandments as best they can.
So, what of those who reject His Gospel, whether as members of LDS Church or not? While most Christian denominations believe in the principle of “once saved, always saved,” the LDS Church does not teach this principle. Through sin, unbelief or rejection, one can lose their place in heaven.
So, for those who have left the Church, forsaken the covenants made at Baptism and through partaking of the sacrament, have they, in fact, given back His name?
And, does it matter?