I was following that same discussion on two other forums, where basically every possible aspect of it was mentioned, and found this specific remark by one of the posters of great help:
Hebrews 4:9 There remaineth therefore a rest to the people of God.
"For the most of the chapter it is not talking about the seventh day Sabbath, but rather entering the rest of God that will come when the Kingdom of God is established, but, verse 9 uses a word that is entirely different from the katapausis used in the other verses. The word used here is Sabbatismos and does mean the seventh day Sabbath and refers back to verse 4."
Personally I haven't seen any mind changed on that subject regardless if discussed over 10 or 25 pages, so generally i keep it with: He that is unjust, let him be unjust still: and he which is filthy, let him be filthy still: and he that is righteous, let him be righteous still: and he that is holy, let him be holy still. (Revelation 22:11)
However, while reading scriptures myself these verses got my attention previously:
Gen 2:1 Thus the heavens and the earth were finished, and all the host of them.
Gen 2:2 And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.
Gen 2:3 And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made.
So anyone living on this same earth would be able to appreciate anything God sanctified. Unless you are thaught he only sanctified it for the Jews but not for Americans.
To the Jews, or in a wider sense "To His people" God explained something regarding relationship and sanctification, as to the "reason why" of that day, and how to discern and know who does the sanctifying. That sign is a mark of orienation given by God, when people are confused about questions of "which god" and their own imaginations.
Ezek 20:12 Moreover also I gave them my sabbaths,
to be a sign between me and them, that they might know
that I am the LORD that sanctify them.
Ezek 20:20 And hallow my sabbaths; and they shall be
a sign between me and you, that ye may know
that I am the LORD your God.
Isaiah 66:15 For, behold, the LORD will come with fire,
and with his chariots like a whirlwind, to render his anger with fury,
and his rebuke with flames of fire.
For by fire and by his sword will the LORD plead with all flesh:
and the slain of the LORD shall be many.
They that sanctify themselves, and purify themselves in the gardens
behind one tree in the midst, eating swine's flesh, and the abomination,
and the mouse, shall be consumed together, saith the LORD.
For I know their works and their thoughts: it shall come,
that I will gather all nations and tongues; and they shall come, and see
my glory.
"They that sanctify themselves, and purify themselves" that's an interesting one, takes a while to think that through regarding its implications....self-help groups with humanistic approaches but religious terms comes to mind, or man-made doctrines, but for the moment, how does the story starting in Genesis end? Does God still keep that day sanctified through the ages, or will we still practise man-made holidays with christian terms in the future after the return of Jesus?
And it shall come to pass, that from one new moon to another,
and from one sabbath to another, shall all flesh come to worship
before me, saith the LORD.
And they shall go forth, and look upon the carcases of the men
that have transgressed against me: for their worm shall not die,
neither shall their fire be quenched; and they shall be an abhorring unto all flesh.
Isaiah 66:23-24
It looks very much like Babylon is the one that is falling, not God's sabbaths.