Why is the concept of substitution important in salvation?

Substitutionary atonement is central to understanding how Christ saves sinners. In John 17, Jesus acknowledges His role in glorifying the Father through the completion of the work given to Him. As the perfect substitute, He fulfilled the law and bore the wrath of God for our sins. Isaiah 53:5 proclaims, 'But he was wounded for our transgressions, he was bruised for our iniquities: the chastisement of our peace was upon him; and with his stripes we are healed.' Without this doctrine, we would be left with the overwhelming burden of our sin and shame. Christ, in His love and obedience, took our guilt upon Himself, ensuring that we could be regarded as righteous in God's sight when we believe in Him. This aspect of salvation assures us that it is Christ’s work alone that secures our standing before God.