first off the Shabbat was established in Gen 2:2 long before the commandments were given on mout sainai! Shabbat is for all mankind, not just the hebrew people. The so called rules and rituals were not given then: it is simply a day of rest.We are to rest and meditate upon G-d. We rest so we do not get so caught up in the effort to acquire possessions, but instead realize that there are other things in life to desire.We are to meditate upon G-d as a reminder that he is, and that he cares for us. These are nor grevious requests, and they are not rituals.
So the Sabbath mentioned in it is not given by the creation, but by Moses. And Moses has nothing to do with other nations than Israel.