Consequently,
just as one trespass resulted in condemnation for all people, so also one
righteous act resulted in justification and life for all people. For just as
through the disobedience of the one man the many were made sinners, so also
through the obedience of the one man the many will be made righteous. Romans 5:18-19
Paul in
Romans makes the case that since Adam caused one sin that caused many to become
sinful, couldn’t Jesus do one righteous act that would domino into many
becoming righteous? Adam multiplied
sinfulness through heredity, passing on the sinful gene through birth. Jesus multiplies righteousness through
belief, passing on the righteous gene by faith.
Plus, don’t forget, as eternal God, Jesus’ righteous act covers all sins
eternally, past-present-future. Adam
could only affect the present and future.