The Quran contains none of the original Hebrew bible. It has some stories in common but is an entirely rewritten text. All of the Old Testament cannonized by the council of Nicea is common, accepted Hebrew scripture- and no new texts are added.
There are some "True" Christians that do follow Kosher laws. Ultra Fundamentalists and Seventh Day Adventists. In spite of New Testament teachings to the contrary which teach that Christians are not under the law and that the law was fulfilled by Christ.
Basically, Christians are told that they do not have to keep Kosher law in the New Testament. You are not saved by works or by keeping the law, but by grace through faith. (Ephesians 2:8-9,Galations, Romans 4-5)
The non Jewish believers in the book of Acts were told that they did not need to burden themselves with Jewish law including circumcision: "But concerning the Gentiles who believe, we have written our decision that they should observe no such thing, except that they should keep themselves from food offered to idols, from blood, from strangled things, and from sexual immorality." (Act 21:25) In Chapters 10 and 11- and early controversy arises which is solved by a vision of Peter:
Romans 6:14 For sin shall not have dominion over you: for ye are not under the law, but under grace.
Colossians 2:14 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;
Finally:
There are some "True" Christians that do follow Kosher laws. Ultra Fundamentalists and Seventh Day Adventists. In spite of New Testament teachings to the contrary which teach that Christians are not under the law and that the law was fulfilled by Christ.
Basically, Christians are told that they do not have to keep Kosher law in the New Testament. You are not saved by works or by keeping the law, but by grace through faith. (Ephesians 2:8-9,Galations, Romans 4-5)
The non Jewish believers in the book of Acts were told that they did not need to burden themselves with Jewish law including circumcision: "But concerning the Gentiles who believe, we have written our decision that they should observe no such thing, except that they should keep themselves from food offered to idols, from blood, from strangled things, and from sexual immorality." (Act 21:25) In Chapters 10 and 11- and early controversy arises which is solved by a vision of Peter:
A couple of more verses:"9 The next day, as they went on their journey and drew near the city, Peter went up on the housetop to pray, about the sixth hour. 10 Then he became very hungry and wanted to eat; but while they made ready, he fell into a trance 11 and saw heaven opened and an object like a great sheet bound at the four corners, descending to him and let down to the earth. 12 In it were all kinds of four-footed animals of he earth, wild beasts, creeping things, and birds of the air. 13 And a voice came to him, "Rise, Peter; kill and eat." 14 But Peter said, "Not so, Lord! For I have never eaten anything common or unclean." 15 And a voice spoke to him again the second time, "What God has cleansed you must not call common." 16 This was done three times. And the object was taken up into heaven again." Acts 10:9-16 NKJV
Romans 6:14 For sin shall not have dominion over you: for ye are not under the law, but under grace.
Colossians 2:14 Blotting out the handwriting of ordinances that was against us, which was contrary to us, and took it out of the way, nailing it to his cross;
Finally:
19What, then, was the purpose of the law? It was added because of transgressions until the Seed to whom the promise referred had come. The law was put into effect through angels by a mediator. 20A mediator, however, does not represent just one party; but God is one.
21Is the law, therefore, opposed to the promises of God? Absolutely not! For if a law had been given that could impart life, then righteousness would certainly have come by the law. 22But the Scripture declares that the whole world is a prisoner of sin, so that what was promised, being given through faith in Jesus Christ, might be given to those who believe.
23Before this faith came, we were held prisoners by the law, locked up until faith should be revealed. 24So the law was put in charge to lead us to Christ[a] that we might be justified by faith. 25Now that faith has come, we are no longer under the supervision of the law. Galations 3:19-25 NIV