Perhaps you can learn more about the New Covenant promised to the house of Israel and to the house of Judah? Here is a prophecy which describes what will happen when the New Covenant is in effect:
"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: 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: 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. 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" (Jer.31:31-34).
First, we can understand that those who will belong to the houses of Israel and Judah will be the physical descendants of Abraham, Isaac and Jacob. That is because their "fathers" were the ones who broke the Lord's covenant and those people were the physical descendants of Jacob. Therefore, since their "fathers" are the physical descendants of Jacob then that must mean that that they will also be the physical descendants of Jacob.
Next, we can understand that all of the physical descendants of Jacob which will belong to both houses will know the Lord,
"from the least of them unto the greatest of them," and they will all have their sins forgiven.
There has never been a time when all of the physical descendants of Jacob belonging to the house of Israel and the house of Jacob have had their sins forgiven. Therefore, the New Covenant promised to those two houses is not now in effect.