However, if you think any iota of the law was abolished, or that we can disobey any laws previously set up by the Most High God, then we *don't* agree on anything
It's really not what I or you "think".
It's "what does scripture say", that we should ask ourselves and honestly look at.
A covenant was the laws, a pact, made with God to us.
The first was removed according to scripture thereby removing the old laws (first covenant) and establishing the new covenant (Christs death, burial resurrection).
The old is "blotted out" (col 2:14). What does "blotted out" mean?
14 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross
ἐξαλείφω exaleíphō - to smear out, i.e. obliterate (erase tears, figuratively, pardon sin):—blot out, wipe away.
It is repeated over and over again in Hebrews about the new covenant replacing the old covenant.
Heb 8
6 But now hath he obtained a more excellent ministry, by how much also he is the mediator of a better covenant, which was established upon better promises.
7 For if that first covenant had been faultless, then should no place have been sought for the second.
8 For finding fault with them, he saith, Behold, the days come, saith the Lord, when I will make a new covenant with the house of Israel and with the house of Judah:
9 Not according to the covenant that I made with their fathers in the day when I took them by the hand to lead them out of the land of Egypt; because they continued not in my covenant, and I regarded them not, saith the Lord.
13 In that he saith, A new covenant, he hath made the first old. Now that which decayeth and waxeth old is ready to vanish away.
Heb 10
1 For the law having a shadow of good things to come, and not the very image of the things, can never with those sacrifices which they offered year by year continually make the comers thereunto perfect.
2 For then would they not have ceased to be offered? because that the worshippers once purged should have had no more conscience of sins.
3 But in those sacrifices there is a remembrance again made of sins every year.
4 For it is not possible that the blood of bulls and of goats should take away sins.
8 Above when he said, Sacrifice and offering and burnt offerings and offering for sin thou wouldest not, neither hadst pleasure therein; which are offered by the law;
9 Then said he, Lo, I come to do thy will, O God. He taketh away the first, that he may establish the second.
It was predicted in the OT
Jer. 31
31 Behold, the days come, saith the Lord, that I will make a new covenant with the house of Israel, and with the house of Judah:
32 Not according to the covenant that I made with their fathers in the day that I took them by the hand to bring them out of the land of Egypt; which my covenant they brake, although I was an husband unto them, saith the Lord:
33 But this shall be the covenant that I will make with the house of Israel; After those days, saith the Lord, I will put my law in their inward parts, and write it in their hearts; and will be their God, and they shall be my people.
34 And they shall teach no more every man his neighbour, and every man his brother, saying, Know the Lord: for they shall all know me, from the least of them unto the greatest of them, saith the Lord: for I will forgive their iniquity, and I will remember their sin no more.
So I say again, Jesus DID abolish the old law with His sacrifice on the cross ("and He nailed it to the cross"- Colossians 2:14). And God didn't have to change His mind either since it was predicted in the OT books.
Therefore God is the one saying He would "remove" the first covenant made with the "fathers" of Israel and replace it with the new covenant. It's right there in the verses I copied down.