Judaism forbids gentiles from keeping Shabbat. It's one of the activities which is unique to Jews and their relationship to Hashem.
To contrast this, we have the Noahide laws which were given to the whole of humanity at the time of Noah. This is the mainstream view of how a non-Jew can honor Hashem under non-Jewish circumstances.
Shabbat is not included in this.
My question is this:
The first Havdalah was lit by Adam and Eve. We actually recite the same words that Adam made at the moment he struck flint to create flame.
“Blessed are You, L‑rd our G‑d . . . who creates the lights of fire,”
If this activity was done at a time before the Torah was given and it involved the precursors to the whole of humanity, why did this get removed from humanity as a whole and not get incorporated into the Noahide laws?
Adam and Eve were not Jewish but they lit Havdalah candles. That implies this activity was a humanity-based activity rather than one unique to just Jews. So why do we forbid non-Jews from fully involving themselves in the Shabbat experience if Adam and Eve (who represent the parents to all of humanity) were doing this?