Paul says we can now be justified from everything that could not be justified by the Law of Moses. It is a VITAL point. Let anyone who thinks that Christians now relate to God through the Spirit being given to help us obey the Law of Moses take note - there were things that it never justified. It is now fulfilled and superseded by the forgiveness of sins in Jesus. This is the point of all evangelistic preaching. We don't do it to Gentiles in the same way as to Jews, but the goal is the same - turn to Jesus not religion (or anything else) to get your sins forgiven