Everyone must remember that the Torah and the Gospels were written by defeated People......the Koran was written at the beginning of there conquest.
not to mention, there were over 20 Gospels written....only 4 were selected (based on the churches necessity) at the Council of Nicea under the auspices of the Emperor Constantine in the 4th century....
IMO....it was mostly to get all the factions on the "same page"....