How does resting on the 7th day just because according to Genesis God created the world in 6 days helps us to see "our true condition"?
It is obviously nothing related to morality.
Well, the Sabbath is much more than that. The Sabbath I believe is a test of our loyalty, because in Scripture we are told whoever we obey is who we serve. Rom 6:16
The 4th commandment is not just the commandment for the Sabbath, it is a commandment for all days.
In the 4th commandment God said
Remember the Sabbath day to keep it holy Exo 20:8, the seventh day is the Sabbath of the Lord thy God. Exo 20:10 So its not just the Sabbath for man, its God's Sabbath and
the holy day of the Lord, thus saith the Lord Isa 58:13 not the man-made one assigned to God He said was for work and labors. Exo 20:9
God commanded us to do work and labors the 6 other days Exo 20:9 and to keep the Sabbath day holy and cease from our works and labors Exo 20:10 God said the Sabbath started at Creation Exo 20:11 so it was always God's perfect plan for mankind, but the devil hijacked this world and counterfeited everything God made to be holy and good.
No one can survive a relationship without special time together. God from the very beginning set aside holy time to rest with man so He blessed and sanctified the seventh day Sabbath Gen 2:1-3 Exo 20:11 made for man Mark 2:27 so we can set aside all of our works and labors and spend time resting in Him on His holy Sabbath day so He can bless Isa 56:2 and sanctify us Eze 20:12 because man can't sanctify a day, nor can they sanctify themselves Isa 66:17 we need God for everything.
God in His own Words said not keeping the Sabbath is doing evil Neh 13:17 Isa 56:2 and its really profaning God Eze 22:26 because its rejecting this special bonding time God made for man from the very beginning and instead man is seeking to find their own way to bless and sanctify themselves instead of receiving God's and being connected to Christ. John 15:4,5,10 1 John 2:6
Why the Sabbath is a sign between God and man
Eze 20:20
hallow My Sabbaths, and they will be a sign between Me and you,
that you may know that I am the Lord your God.’
God placed the Sabbath commandment in the same unit as only worshipping Him and not murdering our brethren. Breaking one commandment we break them all James 2:11-12
We were never told to take the popular route or follow the popular traditions of man. Jesus warned us plainly about both of these Mat 15:3-14 Mark 7:7-13 Mat 7:13-14