When Adam sinned, sin entered the entire human race. Adam's sin brought death, so death spread to everyone, for everyone sinned.
Yes, people sinned even before the law was given. And though there was no law to break, since it had not yet been given,
they all died anyway -- even though they did not disobey an explicit commandment of God, as Adam did. What a contrast between Adam and Christ, who was yet to come!
And what a difference between our sin and God's generous gift of forgiveness. For this one man, Adam, brought death to many through his sin. But this other man, Jesus Christ, brought forgiveness to many through God's bountiful gift.
And the result of God's gracious gift is very different from the result of that one man's sin. For Adam's sin led to condemnation, but we have the free gift of being accepted by God, even though we are guilty of many sins.
The sin of this one man, Adam, caused death to rule over us, but all who receive God's wonderful, gracious gift of righteousness will live in triumph over sin and death through this one man, Jesus Christ.
Yes, Adam's one sin brought condemnation upon everyone, but Christ's one act of righteousness makes all people right in God's sight and gives them life.
Because one person disobeyed God, many people became sinners. But because one other person obeyed God, many people will be made right in God's sight.
God's law was given so that all people could see how sinful they were. But as people sinned more and more, God's wonderful kindness became more abundant.
So just as sin ruled over all people and brought them to death, now God's wonderful kindness rules instead, giving us right standing with God and resulting in eternal life through Jesus Christ our Lord.