He was the only perfect human to ever exist. The Word became flesh and made his dwelling among us. Because of our sin we deserve death, but Jesus did not deserve death because he never sinned. He died in our place to pay for our sins because He loves us. It's like the kid who smashed the car.
Someone has to pay to get the car fixed.
Even if the kids parents forgive him, the car still has to be paid for. Jesus offers His forgiveness as a gift. Like I said before, we can do nothing to make up for our wrongs, we have nothing to offer to God. Jesus offers to pay for our wrongs as a gift to us. You must respond to what God has done.