This dogma is not only a denial of the Mercy of God but also of His Justice. To demand the price of blood in order to forgive the sins of men is to show a complete lack of mercy, and to punish a man who is not guilty for the sins of others, whether the former is willing or not, is the height of injustice.
It is actually not. What it reveals is that God is a God of perfect justice and perfect mercy. On the cross these two extremes are met. The cross is perfect justice because God punishes sin to the fullest (Jesus bore God's wrath on the cross, for all of humanity's sin) and the cross is perfect mercy because God through the cross redeems all those who put their faith in Christ, liberating them from a life of bondage to sin.
Firstly, it is not historically correct to say that Jesus had come to die willingly and deliberately for the sins of men. We read in the Bible that he did not wish to die on the cross. For, when he knew that his enemies were plotting against his life, he declared that his "soul was exceedingly sorrowful unto death", he asked his disciples to keep watch over him to protect him from his enemies and he prayed to God, "Abba, Father, all things are possible unto Thee; take away this from me; nevertheless not what 1 will, but what Thou wilt." (Mark 14:36)
And that was just an expression of Jesus' humanity. He was fully God, then he stepped out of eternity and entered into time, and added humanity to his divinity. The reason he said what he said is not because he would die on the cross, but because he would experience the wrath of God on the cross.
Secondly, we fail to see how the suffering and death of one man can wipe out the sins of others. It sounds something like the physician breaking his own head to cure the headache of his patients. The idea of substitutionary or vicarious sacrifice is illogical, meaningless and unjust.
You fail to see because you are yet dead in your trespasses and sins. The Bible teaches that man is born depraved, hopelessly lost in sin, and that because of this those who are in sin will think that the things of God are foolishness.
'For the preaching of the cross is to them that perish foolishness; but unto us which are saved it is the power of God.
For it is written, I will destory the wisdom of the wise, and will bring to nothing the understanding of the prudent.
Where is the wise? where is the scribe? where is the disputer of this world? hath not God made foolish the wisdom of this world?
For after that in the wisdom of God the world by wisdom knew not God, it pleased God by the foolishness of preaching to save them that believe.
For the Jews require a sign, and the Greeks seek after wisdom:
But we preach Christ crucified, unto the Jews a stumblingblock, and unto the Greeks foolishness;
But unto them which are called, the power of God, and the wisdom of God.
Because the foolishness of God is wiser than men, and the weakness of God is stronger than men.
For ye see your calling, brethren, how that not many wise men after the flesh, not many mighty, not many noble, are called:
But God hath chosen the foolish things of the world to confound the wise; and God hath chosen the weak things of the world to confound the things which are mighty;
And base things of the world, and things which are despised, hath God chosen, yea, and things which are not, to bring to nought things that are:
That no flesh should glory in his presence.' I Corinthians 1: 18-29.
Thirdly, the idea that shedding of blood is necessary to appease the Wrath of God has come into Christianity from the primitive man's image of God as an all-powerful demon. We see no connection at all between sin and blood. What is necessary to wash away sin is not blood but repentance, remorse, persistent struggle against evil inclinations, development of greater sympathy for mankind and determination to carry out the Will of God as revealed to us through the prophets. The Qur'an says:
As I said earlier, the cross will seem like foolishness to those who are dead in trespasses in sins. But in the Old Testament it was God who introduced blood sacrifice for the remission of sins, not just to the the Israelites, but to all people. Here's what's in Levitcus 17 verse 11:
'For the life of the flesh is in the blood: and I have given it to you upon the altar to make an atonement for your souls: for it is the blood that maketh an atonement for the soul.'
What happend on the cross is that Jesus shed his blood (life) and bore all of humanity's sin debt. Because he lived the perfect life those who accept him are then delivered from all the things that they were bound with while they were in their sins, so that they can begin to live a life of holiness, and you also receive Christ's perfect righteousness, because God demands perfection from us.
What you need to understand is, that we are all born in sin and with sin nature, a
natural inclination to do that which is wrong. When you accept Christ, God changes your nature, you are allowed to partake of his divine nature and you can begin to live a
supernatural life. It is natural to live a life a slave to sin, it is supernatural to be able to live above it. This is one of the major differences between Christianity and other religions.