In Roman times crucifixion was only used for the worst criminals. It was the most cruel method of execution because it deliberately delayed death until maximum torture had been inflicted. Despite this reality, the Bible says: "May I never glory except in the cross of our Lord Jesus Christ, through which the world has been crucified to me, and I to the world." (Galatians 6:14).
Why does Christianity glory in the cross of Christ?
GLORYING IN THE CROSS
The cross is glorious because it shows God as both just and merciful. It shows how God's holy love came to terms with humanity's unholy lack of love. The cross explains how God expressed His holy judgment against sin, while at the same time showing His great love in pardoning the repentant sinner. The Bible says "God presented Him [Jesus] as an atoning sacrifice through faith in His blood, in order to demonstrate His righteousness .... He did this to demonstrate His righteousness at the present time, so as to be just and to justify the one who has faith in Jesus." (Romans 3:25-26)
WHY JESUS DIED
In His vast mercy God wanted to forgive sinful people. But because He is also righteous He had to do it in a way that does not approve of sin. So He directed against Himself the full weight of His anger against sin. He did it in the person of Himself - Jesus. On the cross Jesus became guilty of all the adultery, murders and theft ever committed, all the lies ever told, all the cruelty ever done. He became sin for us so we may become the righteousness of God through belief in Him. He was treated as we deserve so we may be treated as He deserves. He suffered the death that was ours that we may have the life that is His. The Bible says "God made Him [Jesus] who had no sin to be sin for us, so that in Him [Jesus] we might become the righteousness of God." (2 Corinthians 5:21)