You are making the superficial error of looking at the physical while omitting the Spiritual.
I showed you with the example of the priest the rabbi and the Samaritan who were not true spiritual Jews and who was the true spiritual Jew. The Gentiles, like the Samaritan, who have not the law, but perform the law, being been born of God, are true Jews.
Romans 2:14 For when the Gentiles, which have not the law, do by nature the things contained in the law, these, having not the law, are a law unto themselves:
If the Gentiles who have not the law (Judaism), do by nature the things contained in the law, are they still Gentiles having not the law within themselves?