God decided to send Jesus in the beginning or else we wouldn’t see the fortelling of this messiah in the Old Testament. All the way back starting in Genesis 1. The only way for us to live, something had to die. The only atonement for sin is death. Fig leaves were not good enough in Gods eyes so he slaughtered ( a lamb most likely) an animal to make them skins for clothes. It was the only way to cover their sin. The shedding of blood. Christ had to take the sins of the world. What you must understand is that Christ wasn’t just the son of God, he was God in human flesh. He created himself. Once you understand the trinity and the spiritual aspect (realm) aka( are born again of spirit) then all of this makes sense. Christ had to suffer. Or else what is the point from genesis to revelation? It was 100% necessary. It had to happen. There was no other way for us to be reconciled to God other than him taking human form and taking the punishment for our sin. It is what explains how god can be both a righteous judge and forgiving at the same time. There is none righteous. If Christ didn’t do then all of humanity would burn in hell. Gods greatest creation would be doomed because not one single person has ever pleased God except himself in the form of the Son. The only perfect spotless blimishless lamb ever to walk the earth.