Seeing as that none of the sacrifices have been good enough to cover the sinful nature of man, there would have to be a sacrifice made that could cover this staining nature if true reconciliation was to be made between men and God. This last and ultimate sacrifice came in the man of Jesus Christ who was 100% man and 100% God. Jesus Christ lived a perfect and sinless life and so the only man undeserving of death died for the sins of the world. As he hung on the cross and the full wrath of God was poured out on him, the law was satisfied. His life was infinitely valuable and being perfect, death could not hold him. And so, he was able to take care of the sins of all men who came to him to ask for his cleansing sacrifice.
What Christ did was more than just for atonement. His sacrifice truly shows the love of God. Nobody lays down his life for a righteous man, but for a good man, someone might dare to die. But Christ, Christ died for the sinner, for the unrighteous. He suffered at the hands of a man he was much better than. He was mocked, bruised and beaten. He had thorns crushed into his skull. He had nails driven through his hands and feet. He hung there, slowly weakening from the strain, unable to push himself up to keep the passage to his lungs open slowly bringing on asphyxiation. If that doesn’t scream love, nothing in this world does. And this love wasn’t poured onto the ones who kept the law (for one, because nobody has kept the law) but on sinful man, the creature whose very nature is to defy the one who hung, who mocked the king of the universe as he hung on the cross. That is the love of God.
This sacrifice brings reunion with God and conquered death for all who believe.
Christ died for the sins of all men so that whoever believes in him would be able to conquer death. Love.