Two relationships made Jesus’ atonement successful. He was human, and therefore on our side. He was Divine, and therefore on God’s side.
A righteous decree had gone forth, that because of their sins, a race must die. Jesus said, “That shall not be. I am God. I belong to God. I belong to the race. I will take these two relationships into the negotiation. I will redeem mankind, though it cost my life.” “O, stop!” cried all the hosts of heaven.