Easter Sunday is the culmination of Holy Week. Easter commemorates the resurrection of Jesus Christ. It is the most important Christian festival, and the one celebrated with the greatest joy. The date of Easter changes each year, and several other Christian festivals fix their dates by reference to Easter.Click to see full answer. Accordingly, what is the significance of Easter Sunday?Easter Sunday is one of the most festive events among Christians worldwide. It commemorates Jesus Christ’s resurrection from death, as written in the Christian bible. Easter Sunday commemorates Jesus’ resurrection from death.Additionally, why is Easter important to the Catholic Church? “Easter is the greatest celebration in the Catholic church because it is the completion of the Holy week that ends with the resurrection of Jesus. Easter celebrates the beginning and foundation of Christianity. Jesus was raised from the dead, and it goes to show that He conquered sin and death. Also, what is the importance of Easter in Christianity? Christians can learn much about Jesus through the last week of his life. Easter is the most important festival in the Christian calendar. It celebrates God raising his son Jesus from the dead as well as the destruction of the power of sin and death forever.Why is called Good Friday?Probably because good used to mean holy. “That terrible Friday has been called Good Friday because it led to the Resurrection of Jesus and his victory over death and sin and the celebration of Easter, the very pinnacle of Christian celebrations,” the Huffington Post suggests.