The Bible says...judge righteously.
We are reminded that under the OT or old covenant a Jew had not officially rejected the coming of Jesus and His sacrifice on the cross. In officially doing by rejecting Him and pinning Him to the cross they forever changed the meaning of Jew....a person who rejects Jesus our Savior.....no one comes to the Father but by me(Jesus).
No Jew is a Christian.....There are Hebrews who are Christian.