Gracious post. But again, I hesitate to second guess God. I don't mean to persist as if the 4th commandment ranked above the other 9, but there is no conclusive evidence from Scripture that the weekly day of rest was ever abolished. And if sanctity is what you're looking for as evidence for its perpetuity, you've no further to look than the origin of the day:I see your point, for I must admit that I did often find it strange that it was a capital crime to violate it. Maybe there's a profundity or sanctity that I am missing about it, but from my perspective, i see it more as a symbolic formality as any festival observance (Galatians 4:9-10), not as an act that edifies or imparts wisdom. But again, to violate it warranted the death penalty...?
Then God blessed the seventh day and sanctified it, because in it He rested from all His work which God had created and made. (Genesis 2:3)
This happened, obviously, before there were any Jewish folks.
God says "Remember the Sabbath, to keep it holy." And most of the church says "Sorry, Lord (Jesus) of the Sabbath (Matthew 12:8), we've got better things to do on the weekend."
Of course, many folks just don't even know about the Sabbath.