For circumcision indeed is of value if you obey the law, but if you break the law, your circumcision becomes uncircumcision. So, if a man who is uncircumcised keeps the precepts of the law, will not his uncircumcision be regarded as circumcision?

Not sure how important this is, but one wonders where Paul got the idea of circumcision turning into the opposite and vice versa.  Consider this from Joshua 5 after the Israel crossed the Jordan into the Promised Land:

At that time the Lord said to Joshua, “Make flint knives and circumcise the sons of Israel a second time.” So Joshua made flint knives and circumcised the sons of Israel at Gibeath-haaraloth. And this is the reason why Joshua circumcised them: all the males of the people who came out of Egypt, all the men of war, had died in the wilderness on the way after they had come out of Egypt. Though all the people who came out had been circumcised, yet all the people who were born on the way in the wilderness after they had come out of Egypt had not been circumcised. For the people of Israel walked forty years in the wilderness, until all the nation, the men of war who came out of Egypt, perished, because they did not obey the voice of the Lord; the Lord swore to them that he would not let them see the land that the Lord had sworn to their fathers to give to us, a land flowing with milk and honey. So it was their children, whom he raised up in their place, that Joshua circumcised. For they were uncircumcised, because they had not been circumcised on the way.

When the circumcising of the whole nation was finished, they remained in their places in the camp until they were healed. And the Lord said to Joshua, “Today I have rolled away the reproach of Egypt from you.” And so the name of that place is called Gilgal to this day.

So for forty years the priests had officiated and the people had taken part in all the feasts without being circumcised.  Basically, because of their rebellion, Israel as a whole had become uncircumcised.

But if circumcision was done away with, then why wouldn’t the host of non-Israelites who left Egypt with them take part in all aspects of their worship?

And the people of Israel journeyed from Rameses to Succoth, about six hundred thousand men on foot, besides women and children. A mixed multitude also went up with them, and very much livestock, both flocks and herds.

So what happens to this large mass of Gentiles?  As far as we know, they are discipled by the Law of Moses so that, when they reach the Promised Land, they are circumcised along with everyone else and grafted into the tribes.  Their uncircumcision has become circumcision.

But there is more, if the Gentiles were made one with Israel due to Israel’s cessation of circumcision, then the trespass of Israel that led to this state is what provided salvation to the Gentiles.  Then, once the fullness of the Gentiles came in, the obedience of them all led to the conquest of the Canaanites.  So the sin of Israel led to salvation for the Gentiles and then the obedience of Israel led to a new creation.