Jesus abolished the Old Covenant replacing it with the New. ““Indeed, a time is coming,” says the Lord, “when I will make a new covenant with the people of Israel and Judah.It will not be like the old covenant that I made with their ancestors when I delivered them from Egypt. For they violated that covenant, even though I was like a faithful husband to them,” says the Lord.” (Jeremiah 31:31–32) (NET)
Also Hebrews: “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: 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.” (Hebrews 8:8–9) (KJV 1900)
So, No more Old Covenant (Ten Commandments). This means, even if the Jews wanted to repent to inherit the land, they cannot. The only repentance is in accepting Christ and being re-attached to biblical Israel the Church.
Also, circumcision, not blood, made one a physical member of Israel and a "Jew". Apart from circumcision they were cut off.