Note that the Noahide laws are the Jewish, not Christian interpretation of this distinction. And there are no sources mentioning them that go back prior to the Jewish/Christian split. (The relevant sections of Talmud are written no earlier than 300 CE.) There’s also some confusion over how those laws work. So for example, one of the seven Noahide prohibitions is the prohibition on illicit relations. But it isn’t clear which prohibited relations are included. There’s an opinion that this includes only adultery and incest and not any of the other Biblical sexual prohibitions (e.g. gay sex, marrying two sisters). There’s a decent halachic argument for something of this form since Jacob marries two sisters. (This actually raises a host of other halachic/theoloical problems for Orthodox Jews because many of them believe that the patriarchs kept all 613 commandments. But this is a further digression...)
Note that the Noahide laws are the Jewish, not Christian interpretation of this distinction. And there are no sources mentioning them that go back prior to the Jewish/Christian split. (The relevant sections of Talmud are written no earlier than 300 CE.) There’s also some confusion over how those laws work. So for example, one of the seven Noahide prohibitions is the prohibition on illicit relations. But it isn’t clear which prohibited relations are included. There’s an opinion that this includes only adultery and incest and not any of the other Biblical sexual prohibitions (e.g. gay sex, marrying two sisters). There’s a decent halachic argument for something of this form since Jacob marries two sisters. (This actually raises a host of other halachic/theoloical problems for Orthodox Jews because many of them believe that the patriarchs kept all 613 commandments. But this is a further digression...)