When Paul was talking about the Gentiles having a "law" in their hearts, it's clear he is addressing the conscience of man - something that is ingrained such as do not kill, do not steal, etc. It's also obvious that Paul was not talking about the Law of Moses. The Gentiles had no idea what that was. Seeing as Romans is talking about all mankind knowing "right from wrong" and recognizing that we are ALL sinners in need of a Savior, to insist that it was the Law of Moses written on their hearts that Paul meant is ludicrous.
Modern day Judaizers will always make salvation dependent on what we "do" instead of what Christ has DONE. Their accursed gospel is disputed by the SAME word of Christ. Grace isn't grace if we have to add our works to the mix.
>>Modern day Judaizers will always make salvation dependent on what we "do" instead of what Christ has DONE.<<
And it comes in many forms. Satan has all bases covered. Take your eyes off grace and he's in control.