Christ Our Substitute

What does it mean that Christ was our Substitute? What does it mean that He suffered on our behalf? In what way did He stand in for us, and in what way did our Lord receive punishment for us? Looking at Isaiah 53, 2 Corinthians 5, and other passages we will see why this has been a treasured doctrine of the church through the ages, and why we must defend against all false versions of atonement or redemption in 21st century Christianity.