Who is a Jew according to the Bible?
Romans 2:28 For he is not a Jew who is one on the outside, nor is circumcision something on the outside, on the flesh. 29 But he is a Jew who is one on the inside, and his circumcision is that of the heart by spirit and not by a written code. That person’s praise comes from God, not from people.
How is this possible?
The answer:
Romans 4:11 And he (Abraham) received a sign—namely, circumcision—as a seal of the righteousness by the faith he had while in his uncircumcised state, so that he might be the father of all those having faith while uncircumcised, in order for righteousness to be counted to them; 12 and so that he might be a father to circumcised offspring, not only to those who adhere to circumcision but also to those who walk orderly in the footsteps of the faith that our father Abraham had while in the uncircumcised state.
16 That is why it is through faith, so that it might be according to undeserved kindness, in order for the promise to be sure to all his offspring, not only to those who adhere to the Law but also to those who adhere to the faith of Abraham, who is the father of us all. 17 (This is just as it is written: “I have appointed you a father of many nations.”) This was in the sight of God, in whom he had faith, who makes the dead alive and calls the things that are not as though they are.
Romans 11:17 However, if some of the branches were broken off and you, although being a wild olive, were grafted in among them and became a sharer of the richness of the olive’s root, 18 do not be arrogant toward the branches. If, though, you are arrogant toward them, remember that you do not bear the root, but the root bears you.
So if you have been grafted in as an adoptive son to the father Abraham, "the father of all those having faith", then you are a Jew and an Israelite.
In fact you can regard yourself Jewish.
Isn't it nice when you meet Jewish people to feel that your father is also Abraham, while they are biologically Abraham's descendants?
Food for thought:
Ezekiel 37:28 And the nations will have to know that I, Jehovah, am sanctifying Israel when my sanctuary is in their midst forever.”’”