We must realize that our own personal sin is what necessitated Christ's death. And only by repenting of our sins and being reconciled to God by the death of Christ can we be assured of eternal life (Acts 2:38 Acts 2:38Then Peter said to them, Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins, and you shall receive the gift of the Holy Ghost.
American King James Version×; John 5:29 John 5:29And shall come forth; they that have done good, to the resurrection of life; and they that have done evil, to the resurrection of damnation.
American King James Version×; John 11:25 John 11:25Jesus said to her, I am the resurrection, and the life: he that believes in me, though he were dead, yet shall he live:
American King James Version×).
This is not to minimize the importance of Christ's resurrection. It, too, is a crucial step in the salvation process (1 Corinthians 15). After being reconciled to God the Father by the death of His Son, ultimately we are saved by Christ's life as He pleads for us in the role of our High Priest and lives in us through the Holy Spirit, helping us to overcome sin (Romans 5:10 Romans 5:10For if, when we were enemies, we were reconciled to God by the death of his Son, much more, being reconciled, we shall be saved by his life.
American King James Version×; Hebrews 4:14-16 Hebrews 4:14-16  Seeing then that we have a great high priest, that is passed into the heavens, Jesus the Son of God, let us hold fast our profession.  For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin.  Let us therefore come boldly to the throne of grace, that we may obtain mercy, and find grace to help in time of need.
American King James Version×; 1 John 2:1 1 John 2:1My little children, these things write I to you, that you sin not. And if any man sin, we have an advocate with the Father, Jesus Christ the righteous:
American King James Version×; Galatians 2:20 Galatians 2:20I am crucified with Christ: nevertheless I live; yet not I, but Christ lives in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
American King James Version×). The process of our coming out of sin is pictured in the biblical feast immediately following Passover, the Days of Unleavened Bread, during which Christ's resurrection occurred.
Yet the Bible nowhere instructs Christians to keep a special celebration of Christ's resurrection like Easter, nor is there a biblical record of early Christians doing so. Instead it's clear that both Jesus Christ and the apostle Paul expected Christ's followers to commemorate His sacrificial death on our behalf in a special ceremony (Matthew 26:26-28 Matthew 26:26-28  And as they were eating, Jesus took bread, and blessed it, and broke it, and gave it to the disciples, and said, Take, eat; this is my body.
 And he took the cup, and gave thanks, and gave it to them, saying, Drink you all of it;
 For this is my blood of the new testament, which is shed for many for the remission of sins.
American King James Version×; 1 Corinthians 5:7 1 Corinthians 5:7Purge out therefore the old leaven, that you may be a new lump, as you are unleavened. For even Christ our passover is sacrificed for us:
American King James Version×; 1 Corinthians 11:23-28 1 Corinthians 11:23-28  For I have received of the Lord that which also I delivered to you, That the Lord Jesus the same night in which he was betrayed took bread:  And when he had given thanks, he broke it, and said, Take, eat: this is my body, which is broken for you: this do in remembrance of me.  After the same manner also he took the cup, when he had supped, saying, This cup is the new testament in my blood: this do you, as oft as you drink it, in remembrance of me.  For as often as you eat this bread, and drink this cup, you do show the Lord's death till he come.  Why whoever shall eat this bread, and drink this cup of the Lord, unworthily, shall be guilty of the body and blood of the Lord.  But let a man examine himself, and so let him eat of that bread, and drink of that cup.
American King James Version×).
Nonetheless, the celebration of Easter prevailed. Those who remained faithful to Christ's example of keeping the Passover and the Days of Unleavened Bread decreased in number and were persecuted by those favoring Easter.