Romans 10:3

For they being ignorant of God’s righteousness, and going about to establish their own righteousness, have not submitted themselves unto the righteousness of God.

Jesus came to this earth to show us the way to righteousness.  Man can never make laws and regulations that compare to what God can do through the heart, and when they tried, people would still go astray in their hearts.  God made us free from sin and death through Jesus.