Joseph Smith taught, "The fundamental principles of our religion are the testimony of the Apostles and Prophets, concerning Jesus Christ, that He died, was buried, and rose again the third day, and ascended into heaven; and all other things which pertain to our religion are only appendages to it." Notice: the Savior's mission was not completed by his death. It was complete when he returned from beyond physical and spiritual death and blazed a trail for us back into heaven.
If Christmas is the day we celebrate the arrival of the Savior who would someday save us, Easter is the day on which we celebrate the fact that he actually did what was impossible to any of the rest of us: died, was resurrected, ascended into heaven and was exalted to his Father's (and our Father's) throne on his Father's (and our Father's) right hand where he beckons to us, "Come unto me and be where I am." And some of us have already (the scriptures say that Abraham, Isaac, and Jacob "have entered into their exaltation, according to the promises, and sit upon thrones, and are not angels but are gods"--see D&C 132:37) and others of us yet will when we have finished our testing. And Easter is when we celebrate that future.
Easter, fundamentally, is Resurrection and Exaltation Day.
If I esteem mankind to be in error, shall I bear them down? No. I will lift them up, and in their own way too, if I cannot persuade them my way is better; and I will not seek to compel any man to believe as I do, only by the force of reasoning, for truth will cut its own way.
"Thou shalt love thy wife with all thy heart, and shalt cleave unto her and none else."