Why is substitutionary atonement important for justification?

Substitutionary atonement is the doctrine that Jesus Christ died in the place of sinners, thereby satisfying God's requirement for justice. 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.' This means that for God to justify sinners, a perfect substitute was necessary to bear the punishment due for sin. Hebrews 9:22 reinforces this concept, stating, 'And almost all things are by the law purged with blood; and without shedding of blood is no remission.' Thus, through Christ’s sacrificial death, believers are justified and reconciled to God.