I like renglemsr's answer. The truth is, back in the days of the 3rd century BCE to about the 5th century CE the Roman empire was running rampant with man/god savours that sacrificed themselves to save mankind. Constantine needed a glue to hold his empire together and he found that in christianity. He molded it to fit into the lines of the mystery cults of Mithras, Horus, Osiris and such. The idea that Jesus had sacrificed himself had already been started by people like Paul and Marcion (which may or may not have been one in the same person). So Constantine adopted christianity as the state religion set doctrine and created a holy book of writings at and after the council of Nicaea that resembled these mystery cults. They sifted through mountains of books, letters (epistles) and writings said to have been from followers of Jesus and chose those that best fit their agenda. That's why God needed a blood sacrifice, because Christianity is a copy of older messianic religions.
Life is in the blood. The second the blood flow stops .. Death occurs. Sin = death. Blood covers or atones sin & death. BUT.... Jesus gave His blood to cover our sin so we do not ever need blood sacrifice again.
Sin is so terrible that the penalty is our lives. We all sin, so we all deserve to die. God created life, so he has the right to punish us by taking it. Jesus died to take our punishment of death, and if we trust in him we put our trust in him we can be saved.
He doesn't ... None of the Prophets before Jesus were known to have preached this concept, nor were any other beliefs or rituals based upon them. Rather, salvation from Hell was achieved through the belief in One God and obedience to His commandments which was preached by all prophets.
This sacrifice would be nothing other than the sacrifice of God himself, incarnate in His "son" Jesus. Therefore Christianity deems all of humanity as damned to Hell for the sin of Adam , Which we are not responsible for ...
So the questions arise, is humanity guilty for the sin which Adam committed by eating from the tree he was forbidden? Must we all repent from that great sin which we didn't commit ?
That God wanted blood is at the bottom of Salvation. This savage "inspiration", that blood appeases god, has its origin in the horrible declaration of biblical god in Hebrews 9:22: "Without the shedding of blood there is no remission of sins".
Under the mosaic dispensation the Jews pacified Jehovah with the blood of animals for remission of a crime. The greater the crime, the greater the sacrifice -- the more blood, the greater the atonement. Every priest was a butcher, and every church a slaughter-house.
According to the Christian system, the last phase of this belief in sacrifice was, that God accepted the blood of his son, and that after murdering his son, he, God, was satisfied, and wanted no more blood. It is claimed that the blood of Jesus softened the heart of God but a little, and rendered possible the salvation of a credulous few. And, in this way the justice of God, and the law of love was satisfied, satiated, surfeited.
But, I ask, be honor bright, what moral man, who ever thinks with his own brain, can believe that only blood could appease God? And yet, the system of Christianity stands upon this belief. Nothing could be more utterly shocking to a civilized and loving soul. It is hard to conceive how the human mind can give assent to such terrible ideas -- to such most fearful savagery, or how any honest man can still believe in the divine inspiration of the Bible?
There is good reason to think albeit sacrilegiously that God was a carnivore.
!; He asked for Isaac to be sacrificed. 2; He accepted Abel's meaty sacrifice and declined the vegetarian sacrifice of Cain. 3; Instead of smearing dough he preferred blood to guide the Angel of death to murder Egyptian first born.4; He sacrificed his own Son for salvation.
In some other places animal sacrifices were practised long before Christianity was exported there. Could it be the same God or man has something inherent about appeasing the deity?
He doesnt any more. But the shedding of blood has long been considered an act of cleansing. Right up until the ninteenth century doctors bled patients to rid them of 'poison' blood and evil vapors. Blood is life. To shed the blood of an animal without blemish was a symbolic giving of life to cleanse away the blemish of sin. One life for another. The animals sacrifice washed away the 'death' sin lay on a humans soul. Shedding of Jesus blood was the final symbolic 'washing' away of human sin, the 'death blemish' of sin that separated God from humanity forever gone. Not that sin was washed from the world but the barrier to Gid it represented was forever destroyed by Jesus ultimate selfless act of love. Since then no blood sacrifice has been necessary.
"the life of the flesh is in the blood "(Leviticus 17:11, 14). Here God tells us that life and blood are essentially one and the same. The blood carries life-sustaining nutrients to all parts of the body. It represents the essence of life. In contrast, the shedding of blood represents the shedding of life, i.e. death. (cont in comments)
This is Old Testament thinking. Jesus WAS the final sacrifice. Since that moment, we entered into a NEW covenant with God. Lucky for us right? Can you imagine how wrecked we would be if we lived under the guideline of the old covenant?...lol Now, if you seek to wash your sin away ('forgiveness') you simply have to ask (and mean it).