Why is believing in Christ's sacrifice essential for Christians?

Faith in Christ's sacrifice is vital for every Christian because it stands at the core of our redemption. According to Ephesians 2:8-9, salvation is a gift of grace, received through faith, not of works. This means that we cannot contribute to our salvation; it is entirely the work of Christ (Titus 3:5). Jesus’ death on the cross is the means by which we are justified before God, rendering us innocent of our sins (Romans 5:1). When we trust in His sacrifice, we are embracing the gift of eternal life and entering into a relationship with God that was made possible by the atoning work of Jesus.