Like I said, from what you posted, you don't understand covenant theology in the slightest. If you understood covenant theoloy, it would be easier to understand why the law was one way in the Mosaic economy and why it is another way in the new covenant of grace, taking the general equity of the law into account.
You don't understand the purpose of the law. Not only do you not understand the purpose, but you don't understand its division between ceremonial, moral, and civil. Furthermore, you don't understand the fullfilment clauses. You don't know what was fullfilled or why it was fullfilled...and what remains binding today.
Like I say, a good systematic theology would bring these pieces together for you so you understand how the covenants relate and apply.