Why was a blood payment necessary for sin?
A blood payment was necessary because the Creator Himself required it for men's sin debt. Sinners are justified freely by God's grace through redemption in Christ Jesus, whom God set forth as a propitiation through faith in His blood, declaring His righteousness for the remission of sins.
Les explains that justification is freely by God's grace, not by anything we do, but through redemption—the process of paying the price and buying something back—in Christ Jesus. God set Christ forth to be a propitiation through faith in His blood. Les acknowledges many people do not like to hear this, but we cannot go around it: there had to be abiding faith that when Christ died, He shed His divine, precious, sinless blood. That was the requirement from the Creator Himself—there had to be a blood payment for men's sin debt. Through faith in His blood, God declares His righteousness for the remission of sins that are passed through the forbearance of God. Christ is just and absolutely fair, and He is the justifier of the one who believes. Nothing else can be added to it.
Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;