Why did it need to be a blood atonement?
Could the atonement for sin have been done another way? The answer is NO! Jesus had to go to the cross and He had to die in exactly the way that it happened. But why? Because it was God’s plan? Well, the answer to that question is a definite yes. If God ordains something, it is guaranteed to come to pass. But there’s much more to the answer, because there’s an underlying question. Why did it need to be a blood atonement? There’s a very simple reason it’s God’s Word that provides it.
Blood ... from the Garden to the Cross
Let’s go back to the beginning when Adam and Eve sinned. The fall of man was a result of their disobedience to God, when God commanded that they were not to eat of the tree of the knowledge of good and evil (Genesis 2:17).
Adam and Eve’s disobedience was sin against God and it broke their union and communion with God. They died spiritually and they began to die physically (Read "Is There an Error in Genesis 2:17 because Adam and Eve Did Not Physically Die?"). The Bible tells us that Adam and Eve’s eyes were opened and they saw that they were naked. In an attempt to cover their sin (evidenced by awareness of their nakedness), they sewed together fig leaves (Genesis 3:7). Of course, their works were not sufficient to cover their sin. Therefore, God in His mercy covered them with animal skins (Genesis 3:21). Animal skins! Don’t read past that too quickly. God’s covering them with animal skins was the first evidence of the necessity of blood to cover sin. And it is the beginning of understanding why Jesus had to die on the cross, in the way that the Gospels record.
God’s Covering of Adam and Eve
1. An animal needed to be killed. Prior to this time there was no death in God’s perfectly created world. Death entered the world when Adam and Eve sinned, and because of their sin the first animal died. The Bible clearly states, in later revelation, that the wages of sin is death (Romans 6:23).