Who is a Jew according to Scripture?

NKJ Version 

--   For he is not a Jew who is one outwardly, nor is circumcision that which is outward in the flesh; but he is a Jew who is one inwardly; and circumcision is that of the heart.     (Romans 2:28-29)

--   For there is no distinction between Jew and Greek, for the same Lord over all is rich to all who call upon Him. (Romans 10.12)

--   Therefore know that only those who are of faith are sons of Abraham.  And the Scripture, foreseeing that God would justify the Gentiles by faith, preached the gospel to Abraham beforehand, saying, “In you all the nations shall be blessed.” So then those who are of faith are blessed with believing Abraham.  (Galatians 3.7-9)

--  For you are all sons of God through faith in Christ Jesus. For as many of you as were baptized into Christ have put on Christ.  There is neither Jew nor Greek, there is neither slave nor free, there is neither male nor female; for you are all one in Christ Jesus.  And if you are Christ’s, then you are Abraham’s seed, and heirs according to the promise.   (Galatians 3.26-29)

--   Therefore remember that you, once Gentiles in the flesh…that at that time you were without Christ, being aliens from the commonwealth of Israel and strangers from the covenants of promise…. But now in Christ Jesus you who once were far off have been brought near by the blood of Christ. For He Himself is our peace, who has made both one, and has broken down the middle wall of separation, having abolished in His flesh the enmity, that is, the law of commandments contained in ordinances, so as to create in Himself one new man from the two, thus making peace…. Now, therefore, you are no longer strangers and foreigners, but fellow citizens with the saints and members of the household of God, having been built on the foundation of the apostles and prophets, Jesus Christ Himself being the chief cornerstone,  in whom the whole building, being fitted together, grows into a holy temple in the Lord,  in whom you also are being built together for a dwelling place of God in the Spirit.   (Ephesians 2.11-22)

--   And he [Abraham] received the sign of circumcision, a seal of the righteousness of the faith which he had while still uncircumcised, that he might be the father of all those who believe, though they are uncircumcised, that righteousness might be imputed to them also, and the father of circumcision to those who not only are of the circumcision, but who also walk in the steps of the faith which our father Abraham had while still uncircumcised….Therefore it is of faith that it might be according to grace, so that the promise might be sure to all the seed, not only to those who are of the law, but also to those who are of the faith of Abraham, who is the father of us all (as it is written, “I have made you a father of many nations”)    (Romans 4.11-12, 16-17)

--  For they are not all Israel who are of Israel, nor are they all children because they are the seed of Abraham; but, “In Isaac your seed shall be called.” That is, those who are the children of the flesh, these are not the children of God; but the children of the promise are counted as the seed.
(Romans 9.7-8)

Comments:  To be a “Jew” is, and always has been, about being in covenant with YHWH.  It isn’t, and never was, about genetics or lineage.  It is not based on blood-line, rather it is based on covenant-line. 
       So NOW, in the New Covenant, it is about worshipping and obeying the “exact image” of YHWH -- that being Yeshua (Jesus) -- and being in covenant-relationship with Him.  Those who do, are Israel: TRUE Jews.