Oh, look, another (so called) believer who thinks his or her sins are let off the hook because of (insert whatever form of contrived scriptural formula) is stuck in their head.
You can "Shabbat" all you please on whatever day you please to do so, however you might want to keep in mind that honesty is a very important matter to God in Christ. And honestly, the evil present within NO PERSON is let off the hook, overlooked, excused or forgiven with God in Christ.
And guess what? We ALL have the same affliction: Matt. 15:19-20, Mark 7:21-23, Matt. 5:28 Romans 7:21.
Yes, evil does come from within. No one rids themselves of this hardline fact. And NO, God never overlooks this internal fact. And NO, God does not BLESS any of our "evil present" within any of us.
In fact the very opposite transpires. Gods Word arouses evil present and empowers it. For example, thinking it can HIDE under terms such as Shabbat or love your neighbors or any number of other dodging dodgy religious formulas. Particularly when we think we're better than other sinners because they don't do (insert whatever religious scriptural formula is contrived to dodge.)
So where you landed is not a new thing and not surprising. It's just another form of DISHONESTY that is constructed by EVIL PRESENT within the person.
As for the "correct formula" for the "Angel" when he marks Gods children, you might find the previous example here:
Ezekiel 9:
4 And the Lord said unto him, Go through the midst of the city, through the midst of Jerusalem, and set a mark upon the foreheads of the men that sigh and that cry for all the abominations that be done IN THE MIDST thereof.
In the midst is a term that's used, in this case, for internal evil. Similar to the internal reality construct described here:
Hosea 4:12
My people ask counsel at their stocks, and their staff declareth unto them: for ->the spirit of whoredoms hath caused them to err,<- and they have gone a whoring from under their God.
Hosea 5:4
They will not frame their doings to turn unto their God: ->for the spirit of whoredoms is IN THE MIDST of them,<- and they have not known the Lord.
And yes, you are right. Understanding GREEK or HEBREW or using any forms of altered translations is going to help anyone when they are DISHONEST before our Maker.
Hebrews 10:22
Let us draw near with a true heart in full assurance of faith, having our hearts sprinkled ->from an evil conscience,<- and our bodies washed with pure water.
Disassociation from this internal fact is all we are offered by scripture. And that is because EVIL PRESENT is demonic, i.e. not the person, but of the DEVIL(s).
Are YOU better because you practive the "SHABBAT?"
Uh, quite frankly, NO. It's one thing to be ignorant of evil present internally. It's quite another to be in deNILE and rebellion to the facts. And it's even worse to excuse and overlook the facts. Typical religious demonology.
Romans 3:9
What then? ->are we better than they? No, in no wise:<- for we have before proved both Jews and Gentiles, that ->they are all under sin;<-
Unfortunately the "internal world" is full of liars, and always has been.
Are you better? Well, tell the truth, and we'll see.
Shabbat and Yeshua is waiting to HEAR just a little spittle of HONESTY come out from under your threshold.