The New Testament says no such thing, if Romans 14 is being referred to here. It merely says that certain people do esteem all days alike, but does not say so about God. Read Romans 6:1-2 and Jude 1:4 to not be mistaken about what grace is. Trying to scrap the law, over whose breach Israel and Judah were both punished, is a doctrine too like unto the Koran—God does not change, and nobody gets away with it. If anyone is not clear that the law still stands and for eternity, also read 1 John 3:4.
No, I must disagree with your analysis!
You are looking at shadows still. Not at light.
You beg the question when you say that the righteousness of Christ is to be stuck in a particular framework of earthly law. Law was only put there as a means by which light could be expressed. Where will mother and father even BE in the eternal realms? Where will sabbath days even BE? All once-human beings will be on the same footing. Time is gone.
Let me make a bold analogy.
God made us all to be wonderful musicians. We could play any instrument we wanted with beautiful melody and skill. God asked us to play all we wanted for Him, and He’d fill us with the skill to do it. However He gave us the choice.
Well, we conspired and decided to get ugly with God. Instead of doing that beautiful music, we cut some of our fingers off. We blinded ourselves. We smoked ourselves to the point we could not even blow a flute. Then God said to various groups of us okay, you think you are so wonderful, play this or that score for me! You can’t! But we said, yes we can. So God said, Go ahead. And the predictably laughable result ensued. Then God said, I will take pity on you if you will receive my miraculous restoration. The restoration will not occur all at once, but you will gain skill as it takes place, and the music you play at the end will be wondrous. And God kept that promise.
And here we are arguing about music scores!
Nobody gets away with “sin” — but “sin” is a category that transcends law. Law is a ready metric for how well one is living in the opposite of sin which is righteousness.
The commandment of Christ is to follow Him in love. And if we are honest we will look at ourselves and say that we are bucking Him, sometimes severely! We can feel that rebellion in our own bones and sometimes, sadly, we even call it righteousness! Such jags as what you have gotten into are one example of this. But God has mercy. He will have mercy on you.
Love — THAT’S the commandment He ties us to from here into an infinite eternity. A man might even in principle be able to keep that entire “Ten Commandments” from his youth up and when God looks at him in love and asks “OK, follow Me” — refuse because he’s tied to earthly things yet.
I am not an antinomian. (Anti being against, nomian meaning law.) I am more like a nomometric. (Nomos meaning law, metric meaning measurement.) People are going to expect you to obey law here on earth because that’s the way men have attempted to frame in love. Well, usually you can but sometimes the law of love says it’s time to transcend it.
And that is why Jesus carried on the way He did. There’s no other adequate explanation!