My last question was, should we interpret the Bible by looking at the Quran and then interpreting the New Testament from that, by what the Quran says, and then finding proof for that in the Bible? That is exactly the right way to go about it. The Holy Quran came as the judge of whatever had passed before it. So the Holy Quran took such teachings from the earlier books as had the staying power, everlasting truth, and rejected the falsehood added later on by human beings.
So all the interpolations made by the later period scholars were rejected by the Holy Quran. So it gave a true picture of original teachings of Torah as well as the teachings of Jesus Christ, whatever they were. In light of the Holy Quran, when you preach to the Christians and the Jews, you will find enough evidence in their books to prove it to them. Otherwise if you reject the books, they would say, well, we believe in our book, you believe in your book, and there is no common platform.
But the Holy Quran does not say, it says they still contain passages using which you can refute their views from their own books. So this is the best approach you should make in the light of the declarations of the Holy Quran. You study their books in which they believe and tackle them through this way.
