Christianity is ROOTED in Judaism. Have you forgotten that Jesus lived as a Jew? He never denied ANY of the Jewish teachings. He simply enhanced them with the Love Of God.
The Words Of The Gospel are NOT just in the New Testament, They are included in the ENTIRE Bible. The Old Testament is Jewish. The Old AND New Testaments are Christian. If you read the Bible from cover to cover, you will understand that Christians are ADOPTED Jews.
Personally, I am Catholic and I use a slightly different Bible than other Christians. But, when I get involved in a religious debate, I use the Old King James Version of the Bible, since it seems to be the most acceptable version. It tells me I am an ADOPTED Jew AND a Christian.