Why is the deity of Christ important for Christians?

The deity of Christ is vital for the Christian faith because it affirms that Jesus is not merely a good teacher or prophet but God Himself in human flesh. As stated in Isaiah 42, God's servant will not fail, which means if Christ is God, He cannot fail in accomplishing salvation. Denying the deity of Christ threatens the very foundation of redemption; if Jesus were not divine, His sacrifice would have no real efficacy to atone for sin. This doctrine reassures believers that salvation is entirely a work of God, not reliant on human merit or decision, which aligns with the biblical teaching that we are saved by grace through faith, which itself is a gift from God.