How does the Bible define a Jew?
For they are not all Israel, which are of Israel: neither, because they are the seed of Abraham, are they all children: but, in Isaac shall thy seed be called. That is, they which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed. Romans 9:6-8
For ye are all the children of God by faith in Christ Jesus. For as many of you as have been baptized into Christ have put on Christ. There is neither Jew nor Greek, there is neither bond nor free, there is neither male nor female: for ye are all one in Christ Jesus. And if ye be Christ's, then are ye Abraham's seed, and heirs according to the promise. Galatians 3:26-29 (See Genesis 12:1-3 and Genesis 22:15-18 for that promise.)
For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh: but he is a Jew, which is one inwardly; and circumcision is that of the heart, in the spirit, and not in the letter; whose praise is not of men, but of God. Romans 2:28-29 (See, also, Jeremiah 31:33.)He is a Jew who is circumcised of heart.
For in Christ Jesus neither circumcision availeth anything, nor uncircumcision, but a new creature. Galatians 1:5
Jesus answered, Verily, verily, I say unto thee, Except a man be born again of water and of the Spirit, he cannot enter into the kingdom of God. John 3:5
For we are the circumcision, which worship God in spirit, and rejoice in Christ Jesus, and have no confidence in the flesh. Philippians 3:3
In whom also ye are circumcised with the circumcision made without hands, in putting off the body of the sins of the flesh by the circumcision of Christ: buried with him in baptism, wherein also ye are risen with him through the faith of the operation of God, who hath raised him from the dead. Colossians 2:11-12
What advantage then hath a Jew? Or what profit is there of circumcision? Much every way: chiefly, because that unto them were committed the oracles of God. For what if some did not believe? Shall their unbelief make the faith of God without effect? God forbid: yea, let God be true, but every man a liar: as it is written, that thou mightest be justified in thy saying and mightest overcome when thou art judged. Romans 3:1-3
So then faith comes by hearing, and hearing by the word of God. Romans 10:17
But be ye doers of the word, and not hearers only, deceiving your own selves. James 1:22
It is not enough to have the oracles of God but one must be born ....
They answered and said unto him, Abraham is our father. Jesus saith
unto them, If ye were Abraham's children, ye would do the works of
Abraham. John 8:39
Think not to say within yourselves, We have Abraham to our father: for I say unto you, that God is able of these stones to raise up children unto Abraham. Matthew 3:9
Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven. Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? And in they name have cast out devils? And in they name done many wonderful works? And then I will profess unto them, I never knew you: depart from me, ye that work iniquity. Matthew 7:21-23
The synagogue of Satan.
In the beginning was the Word, and the Word was with God, and the Word was God. ...And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth. John 1:1,14
And the disciples were called Christians first in Antioch. Acts 11:26
And why call me, Lord, Lord, and do not the things which I say? Luke 6:46
Thou shalt not take the name of the LORD thy God in vain, for the LORD will not hold him guiltless that taketh his name in vain. Exodus 20:7
I know the blasphemy of them which say they are Jews, and are not, but are the synagogue of Satan. Revelation 2:9
Regardless of one's religious zeal or works it is through faith in Jesus one is saved and becomes a child of God.
I say the truth in Christ, I lie not my conscience also bearing me witness in the Holy Ghost, that I have great heaviness and continual sorrow in my heart. For I could wish that myself were accursed from Christ for my brethren, my kinsmen according to the flesh: Romans 9:1-3
Brethren, my hearts desire and prayer to God for Israel is, that they might be saved. For I bear them record that they have a zeal of God, but not according to knowledge. Romans 10:1-2
My people are destroyed for lack of knowledge: because thou hast rejected knowledge, Hosea 4:6
For they being ignorant of God's righteousness, and going about to establish their own righteousness, have not submitted themselves unto the righteous of God. Romans 10:3
Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference: Romans 3:22
But when the fulness of the time was come, God sent forth his Son, made of a woman, made under the law, to redeem them that were under the law, that we might receive the adoption of sons. And because ye are sons, God hath sent forth the Spirit of his Son into your hearts, crying Abba, Father. Galatians 4:4-6
If thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. For with the heart man believeth unto righteousness; and with the mouth confession is made unto salvation. For the scripture saith, Whosoever believeth on him shall not be ashamed. For there is no difference between the Jew and the Greek: for the same Lord over all is rich unto all that call upon him, for whosoever shall call upon the name of the Lord shall be saved. Romans 10:9-13
The plan of salvation has not changed. It is no different for us than it is the Jew or those who lived before Christ's first advent.
I am the LORD, I change not; Malachi 3:6
Jesus Christ the same yesterday, and to day, and for ever. Hebrews 13:8
Your father Abraham rejoiced to see my day: and he saw it, and was glad. John 8:56
By faith Abraham, when he was tried, offered up Isaac: and he that had received the promises offered up his only begotten son, of whom it was said, That in Isaac shall thy seed be called: accounting that God was able to raise him up, even from the dead; from whence also he received him in a figure. Hebrews 11:17-19
And Abraham said, My son, God will provide himself a lamb for a burnt offering: so they went both of them together. Genesis 22:8-9
The true Jew, in spirit, both keeps the commandments of God and have put their faith in Jesus Christ, the only begotten Son of God. The Lamb of God who takes away the sin of the world.
Believe me, the hour cometh, when ye shall neither in this mountain, nor yet at Jerusalem, worship the Father. Ye worship ye know not what: we know what we worship: for salvation is of the Jews. But the hour cometh, and now is, when the true worshippers shall worship the Father in spirit and in thruth: for the Father seeketh such to worship him. John 4:21-23
And the dragon was wroth with the woman, and went to make war with the remnant of her seed, which keep the commandments of God, and have the testimony of Jesus Christ. ...for the testimony of Jesus is the spirit of prophecy. Revelation 12:17; 19:10
To the law and to the testimony: if they speak not according to this word, it is because there is no light in them. Isaiah 8:20
Search the scriptures, for in them ye think ye have eternal life: and they are they which testify of me. John 5:39
Ye are of your father the devil, and the lusts of your father ye will do. He was a murderer from the beginning, and abode not in the truth, because there is no truth in him. ...He that is of God hearth God's words: ye therefore hear them not, because ye are not of God. John 8:44,47
If God were your Father, ye would love me: John 8:42
If you love me, keep my commandments. John 14:15