Question on 2 Corinthians 5:21?

You will have to go back and study the Old Testament practices of offering up sin offerings. When the High Priest offering up a sin offering to the Lord. It had to be without blemish, spot, or defect. Because the unblemished sacrifice represented the Messiah to come (Jesus), who would be perfect and without blemish or sinless. However, at Atonement, once the animal was brought before the slaughter. The sins of the people were transferred to the guiltless and unblemished animal. At the point of slaughter, all the sins of the people were now on the animal. Okay, go to Isaiah 53:5-6, it says, "He was wounded for our transgressions, He was bruised for our iniquities. The chasetisement of our peace was upon Him and with His stripes we are made whole. All we like sheep have gone astray; we have turned every one to his own way; and the Lord hath laid on Him the iniquity of us all. Clearly, Isaiah points out that the iniquities of man would be laid on the Messiah. At the point He was taken and put up on the Cross, all the sins of mankind, past, present, and future where transferred to Him on the Cross. So, He does fulfill tha nature of the sin offering according to the Old Testament. He took our place of sinfulness and exchanged it with His righteousness. And, it was no different in the Old Testament. A guiltless unblemished animal had to have people's sins transferred to it, in order for the Israelites to have their sins atoned for and be righteous before the Lord.