the torah (first 5 books of the bible) was written first, approx 1400BC,
then the rest of the old testament,
then the new testament,approx 50 to 90 ad
then the Koran, approx 600 AD
then read them in order and that might make more sense,
i did, and found that where the new testament and then the Koran dissagreed with the first 5 books of the bible, i would say that the first 5 books are correct, and then any variations after that, disregard.