But now the righteousness of God has been manifested apart from law, although the law and the prophets bear witness to it, the righteousness of God through faith in Jesus Christ for all who believe.
The Law and the prophets are God's x-rays. They can diagnose what's wrong with us. But, like x-rays, they can't heal us. Only Jesus the Physician can do that. That is Paul's point throughout Romans. It 's still true.