If the wages of sin are death, and Christ never sinned, how could God be right and just in commanding Jesus to die the death that he died? If there was no sin in Christ, wouldn't God have been wrong in commanding his death?
The only way that God can be right and just in making such a commandment was that there was sin in the body of Jesus that had to be destroyed. This physical nature, styled by God in the Bible "sin in the flesh" or "sin that dwelleth in me" is the root of all sin in mankind. It is the lust of the eyes, the lust of the flesh, and the pride of life (1 John 2:16) which dwells in all the descendants of Adam including Christ. This sinful flesh had to be destroyed, to remove willfulness and temptation from the body, that we might live life in immortality.
This is the reason that God was just and right in commanding Christ to go up on the cross. The declaration that Jesus made upon the cross was: "Here is how sinful flesh should be treated. It is fit only for destruction." When we recognize this, then, and only then, is God willing to forgive us our transgressions. Therefore, Christadelphians believe:
VI.--That God, in His kindness, conceived a plan of restoration which, without setting aside His just and necessary law of sin and death, should ultimately rescue the race from destruction, and people the earth with sinless immortals.