The resurrection of Jesus Christ is the central truth in Christianity. If Jesus did not rise from the dead then his claims to be God were utter nonsense. It would not make any difference whether or not his moral teachings were good and inspirational because his whole life would have been a lie.
Jesus resurrection established, once and for all, that He is the only way to heaven. Others can make a claim to show us the road to personal enlightenment or the road to utopia , but only Jesus proved that He had the Way to God. In other words the Resurrection certifies Jesus’ claim to be “the way, the truth, and the life," and it means He was telling the truth when He said, “No one can come to the Father except through me” (John 14:6; NLT).
The apostle Paul wrote this about the resurrection:
Now let me remind you, dear brothers and sisters, of the Good News I preached to you before. You welcomed it then and still do now, for your faith is built on this wonderful message. And it is this Good News that saves you if you firmly believe it -- unless, of course, you believed something that was never true in the first place. I passed on to you what was most important and what had also been passed on to me -- that Christ died for our sins, just as the Scriptures said. He was buried, and he was raised from the dead on the third day, as the Scriptures said (1 Corinthians 15:1-4; NLT).
The Apostle Paul said that this truth is of first importance: that Jesus died for our sins and that He rose from the dead. To the Apostle a person could not separate Jesus' death from His resurrection. Jesus death is important, but it would be without meaning if He was not resurrected. It is trusting God's power in both the the death of Jesus and the resurrection of Jesus that saves us. Everything about Christianity flows from Jesus’ death and resurrection.
It is for this reason that C. S. Lewis can write that the resurrection of Jesus “changes everything.” If we don't believe that Jesus rose from the dead there are a number of different ways we could live our lives, but once we place our faith in the God who raises the dead, that God seen through Christ Jesus, then there is only one way for us to live, to follow Jesus. To believe in the resurrection means that we will spend our lives working for the Kingdom to bring the message of God's love, forgiveness, and hope to the world. The resurrection changes everything because it changes our perspective on the world, it gives us hope that God will one day make everything right, and in the meantime we do what we can to see that God's will is done on earth as it is done in heaven.