Christianity is Jewish...IF...you believe the Bible.
Consider this Bible verse:
"But he is a Jew....which is one 'inwardly'....is that of the heart...in the spirit...and, not in the letter....but of God" (Romans 2:29).
Now, is that really so strange ?
Jesus Christ...our Lord and Savior...himself, was a Jew.
And aren't Christians suppose to have Jesus in our hearts ?
Romans 2:28. For he is not a Jew, which is one outwardly; neither is that circumcision, which is outward in the flesh:
29. 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.
Yes it simply means that the physical Jew is not the Jew any more,
but the true Jew is one inwardly where cicumcision is of the heart, in the spirit. Christians are spiritual Jews and the people of God. The physical Jews under the law given by Moses are no longer of God and can not be unless they Confess and believe Christ. Then they can be Jews again but of the Spirit. Spiritual.
Colossians 3:1. If ye then be risen with Christ, seek those things which are above, where Christ sitteth on the right hand of God.
2.
Set your affection on things above, not on things on the earth. 3. For ye are dead, and your life is hid with Christ in God.
4. When Christ, who is our life, shall appear, then shall ye also appear with him in glory.
5. Mortify therefore your members which are upon the earth; fornication, uncleanness, inordinate affection, evil concupiscence, and covetousness, which is idolatry:
6. For which things' sake the wrath of God cometh on the children of disobedience:
7. In the which ye also walked some time, when ye lived in them.
8. But now ye also put off all these; anger, wrath, malice, blasphemy, filthy communication out of your mouth.
9. Lie not one to another, seeing that ye have put off the old man with his deeds;
10.
And have put on the new man, which is renewed in knowledge after the image of him that created him:
11. Where there is neither Greek nor Jew, circumcision nor uncircumcision, Barbarian, Scythian, bond nor free: but Christ is all, and in all. 12. Put on therefore, as the elect of God, holy and beloved, bowels of mercies, kindness, humbleness of mind, meekness, longsuffering;
13. Forbearing one another, and forgiving one another, if any man have a quarrel against any: even as Christ forgave you, so also do ye.
14. And above all these things put on charity, which is the bond of perfectness.
15.
And let the peace of God rule in your hearts, to the which also ye are called in one body; and be ye thankful.
Paul lists Jews, Gentiles and God's church seperately in this verse. Other verses make distinction also.
However it is Jews and Gentiles called by the gospel of Jesus Christ that are ONE in Christ Jesus and makeup the church of God.
1 Corinthians10:32. Give none offence, neither to the Jews, nor to the Gentiles, nor to the church of God:
1 Corinthians 12:13. For by one Spirit are we all baptized into one body, whether we be Jews or Gentiles, whether we be bond or free; and have been all made to drink into one Spirit.