Why is Christ's sacrifice necessary for salvation?

The necessity of Christ's sacrifice arises from mankind's inherent sinfulness. The Bible teaches that all have sinned and fall short of the glory of God (Romans 3:23). Because of our sin, we are under God's wrath and unable to make atonement for ourselves. Christ, being sinless, provided the perfect sacrifice that we could not offer. His death on the cross was not merely a moral example; it was a substitutionary atonement where He bore the penalty for sin that was due to His people. With His statement, 'It is finished,' He confirmed that He had accomplished what was necessary for the redemption of those who are His (John 10:11, 1 John 2:2).