Hi gotime, I enjoyed what you posted so far, and sorry to hear you are withdrawing. Even so, there is much here already to consider. Sabbath is one of my most favorite topics, seeing how many times it is mentioned in the Bible, both NT and OT.
As any ruler would have to do, establish authority in order to reign, so did our Creator. He gives account of all He created, then He establishes a sign of that authority. He called that sign a gift for man. Indeed it is.
God bless you in your studies too.