--The Message of the Cross boils down to this..... ---CHRIST BECAME OUR SIN ~Why is the Cross the symbol of our faith? To find the answer look no farther than the Cross itself. Its design couldn't be simpler. One beam horizontal--the other vertical. One reaches out--like God's love. The other reaches up--as does God's holiness. One represents the width of His love; the other reflects the height of His holiness.
The Cross is the intersection . 
The Cross is where God forgave His children without lowering His standards.
How could He do this?
In a sentence: God put our sin on His Son and punished it there."He made Him who knew no sin to be sin for us, that we might become the righteousnesss of God in Him" (2 Corinthians 5:21).Envision the moment. God on His throne. You on the earth. And between you and God, suspended between you and heaven, is Christ on His Cross. Your sins have been placed on Jesus. God, who punishes sin, releases His rightful wrath on your mistakes. Jesus receives the blow. Since Christ is between you and God, you don't.
The sin is punished, but you are safe--safe in the shadow of the Cross.This is what God did, but why, why would He do it? Moral duty? Heavenly obligation? Paternal requirement? No. God is required to do nothing.
Besides, consider what He did. He gave His Son. His only Son. Would you do that? Would you offer the life of your child for someone else? I wouldn't. There are those for whom I would give my life. But ask me to make a list of those for whom I would kill my daughter? The sheet will be blank. I don't need a pencil. The list has no names.
But God's list contains the name of every person who ever lived. For this is the scope of His love. And this is the reason for the Cross.
He loves the world...(John 3:16) 
--(From:
He Chose the Nails -By: Max Lucady)