ok Grandpa I am going to address the text you gave and we will see if they actually say what you are saying.
you quoted these texts:
Gal 3:10 For as many as are of the works of the law are under the curse: for it is written, Cursed is every one that continueth not in all things which are written in the book of the law to do them.
Gal 3:11 But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith.
Gal 3:12 And the law is not of faith: but, The man that doeth them shall live in them.
Gal 3:13 Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree:
Gal 3:14 That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith.
you seem to suggest the following is in line with these texts:
"If you look back to the OT and say "we need to do that" that is working at the law. If you look at the 10 commandments and say "that still has authority over a Christian" you are working at the law."
So the question is do the verses given indicate what you said above? Lets look and see if they say anything like that.
First verse you sited: Gal 3:10 For as many as are of the works of the law are under the curse: for it is written, Cursed is every one that continueth not in all things which are written in the book of the law to do them.
so far we have the term "works of the law" but no real explanation as to what that term means. However its clear that to be of the works of the law is to be under a curse and Paul quotes scripture:
Deu 27:26 Cursed be he that confirmeth not all the words of this law to do them. And all the people shall say, Amen.
Context is the whole book of Deuteronomy which was a book of the law written by Moses:
Deu_31:24 And it came to pass, when Moses had made an end of writing the words of this law in a book, until they were finished,
This book of the law was placed in the side of the ark:
Deu_31:26 Take this book of the law, and put it in the side of the ark of the covenant of the LORD your God, that it may be there for a witness against thee.
It acted as a witness that they had accepted the rules of this law before entering the promised land and also that they accepted the conditions.
So we see that Paul is most clearly referring to the book of Deuteronomy specifically.
So does Paul mean anyone who does anything that is in the book of the law is turning from Christ?
Notice this part:
Deu 6:5 And thou shalt love the LORD thy God with all thine heart, and with all thy soul, and with all thy might.
We could quote many things but this one will make the point and keep it shorter. Is Paul suggesting that anyone who loves the Lord with all their heart and soul and strength is now of the law and must keep it all to be safe?
No of course not, Jesus even taught to love the lord in this manner with these words.
So it is established that Paul is not simply trying to say that obeying any of the law means you have to do everything. He is also not saying that faith is against loving God. Paul was a proponent for loving God and our fellow man.
So clearly this text does not support your view that doing something from the OT means your working at the law.
Then Paul says this:
Gal 3:11 But that no man is justified by the law in the sight of God, it is evident: for, The just shall live by faith.
Did you realise this is a reference to the OT?
Hab 2:4 Behold, his soul which is lifted up is not upright in him: but the just shall live by his faith.
I guess the problem you have here is Paul is backing his points up with looking back to the OT. So should Paul now obey everything the OT says because he uplifts one part? The reality is in all his letters he uplifts many parts.
The prophets were there to correct Israel when they went wrong, This tells us that the Just shall live by faith as Paul is clearly showing here is exactly how Israel were meant to live. They were not saved by works and thus Paul establishes his teaching of faith vs works form the OT.
Gal 3:12 And the law is not of faith: but, The man that doeth them shall live in them.
Did Paul say you can't keep the law in faith? no
Did he say that the law and faith are against each other? No
Read what it says not what you want it to say.
Paul also said:
Rom 3:31 Do we then make void the law through faith? God forbid: yea, we establish the law.
So don't read what is not there. Don't make up meanings that Paul did not say.
Gal 3:13 Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree:
Notice again "for it is written"
Paul again is referencing the book of the law/Deut.
Deu 21:22 And if a man have committed a sin worthy of death, and he be to be put to death, and thou hang him on a tree:
Deu 21:23 His body shall not remain all night upon the tree, but thou shalt in any wise bury him that day; (for he that is hanged is accursed of God
that thy land be not defiled, which the LORD thy God giveth thee for an inheritance.
What is the curse of the law?
Deu 27:26 Cursed be he that confirmeth not all the words of this law to do them. And all the people shall say, Amen.
So the curse is for the people if they do not do all the words of this book of the law.
Gal 3:14 That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith.
Here is the point Paul is making, We are not saved by following rules, we are saved by faith.
Here is what Paul did not say, He did not say there are no rules or everything in the law is bad.In fact Paul quite clearly taught from the law and upheld the law.
He makes the point that salvation by faith is actually OT. The fact that he references the book of the law is revealing, Because if you follow all of it you would have to reject Christs sacrifice and continue to offer animal sacrifices as the book of the law says. That is the point, the Galatians are not being made to sacrifice, There is no hint that the Jews are pushing them to offer sacrifice. But Galatians speaks of circumcision and obeying the law of Moses/ The book of the law.
Jos_8:31 As Moses the servant of the LORD commanded the children of Israel,
as it is written in the book of the law of Moses, an altar of whole stones, over which no man hath lift up any iron: and they offered thereon burnt offerings unto the LORD, and sacrificed peace offerings.
Jos_8:32 And he wrote there upon the stones a copy of the law of Moses, which he wrote in the presence of the children of Israel.
We see here the law of Moses is in fact the book of the law or Deuteronomy which Moses wrote and charged Israel before they entered the promised land.
Here is where Joshua is refering:
Deu 27:5 And there shalt thou build an altar unto the LORD thy God, an altar of stones: thou shalt not lift up any iron tool upon them.
Deu 27:6 Thou shalt build the altar of the LORD thy God of whole stones: and thou shalt offer burnt offerings thereon unto the LORD thy God:
Deuteronomy is the law of Moses.
Thus we see that the issue here is in regards to the book of the law/ Deuteronomy otherwise known as the law of Moses.
They pushed on top of this the idea of circumcision. as see else where and here.
Act_15:5 But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses.
SO when you actually go and look at the points Paul is trying to make and see where he is getting his points from it paints a much clearer picture of what He means and why.
By the way they were also pushing circumcision in Galatians also. Same issue.
I have noticed that you have as far as I have seen never once used the references Paul is using to explain your position. This seems to me that you don't know them and thus have mistakenly made Paul say something He really was not saying.
You seem to do the same for Hebrews. Every time you quote Hebrews 4 I have never seen you give attention to the references that Hebrews 4 does. Ill get on to Hebrews 4, but it references, Joshua, Duet, Exodus, the psalms, Genesis. Without knowing these things we make the NT say things it never meant because we ignore the very foundation of their argument.