Read Romans 7:1-6

So, my dear brothers and sisters, this is the point: You died to the power of the law when you died with Christ. And now you are united with the one who was raised from the dead. As a result, we can produce a harvest of good deeds for God. - Romans 7:4 (NLT)

The law shows us our sin, but obeying it enough to earn our salvation is impossible. Therefore, Jesus Christ, through His sinless life, His death and resurrection, has earned our salvation for us, and we are now free and empowered to live as children of God in the power of the Holy Spirit.