Amen! Great idea!
ok - so given that we all agree that the ten commandments (including the Sabbath commandment) are unchanged and written on the heart under the New Covenant of Jer 31:31-34 (also quoted verbatim in Heb 8:6-12) - And that is not questioned...
Ex 20:10 "the seventh day IS the Sabbath of the LORD (YHWH)"
Exodus 20:11
11 For in six days the Lord made the heavens and the earth, the sea and everything that is in them, and He rested on the seventh day; for that reason the Lord blessed the Sabbath day and made it holy. NASB
11 For in six days the Lord made the heavens and the earth, the sea, and all that is in them, and rested the seventh day. Therefore the Lord blessed the Sabbath day and hallowed it NKJV
Gen 2:1-3
And so the heavens and the earth were completed, and all their heavenly lights. 2 By the seventh day God completed His work which He had done, and He rested on the seventh day from all His work which He had done. 3 Then God blessed the seventh day and sanctified it, because on it He rested from all His work which God had created and made.
Some would argue that the most unreliable/untrue thing about the Sabbath is that "Detail" it highlights about creation week being the same 7 day sequence as we see Israel is commanded to remember in Exodus 20.
So then what does the Sabbath tell us about the Bible doctrine on origins - the creation of all life on Earth? Specifically in regard to what actually happened "in nature" in real history, in real time when it comes to the origins of all life on Earth?
Conversely - if you claim that a big bunny rabbit formed the world and placed easter eggs on it that would later evolve into horses and rabbits - is that sort of "never happened in nature" claim even remotely "science"? If it "never happened in nature" -- then my friends - it cannot be observed to happen in nature and therefore is not science.
Romans 1 says that even pagans have a certain level of knowledge -
18 For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of people who suppress the truth in unrighteousness, 19 because that which is known about God is evident within them; for God made it evident to them. 20 For since the creation of the world His invisible attributes, that is, His eternal power and divine nature, have been clearly perceived, being understood by what has been made, so that they are without excuse. 21 For even though they knew God, they did not honor Him as God or give thanks, but they became futile in their reasonings, and their senseless hearts were darkened.
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Also notice in Exodus 16:23 it is not just "any 7 day sequence you like" but rather -- "tomorrow IS the Sabbath" -
Not just "one day in seven" but "tomorrow is the day".
In Gen 2:1-3 it is not Adam's 7th day of life - it is his first full day of life after having been created on day 6.