So the holiness of the Quran is a fact, is it? Not "what Muslims call the holy book," not "the Muslim holy book" -- just "the holy book." No qualifier needed.
AP won't call the Islamic terrorists "terrorists" because that designation is a matter of opinion. But they have no problem reporting that the Quran is the holy book as if that assertion were an undeniable truth of the universe.
I'll look forward to an AP article that refers in the same manner to the Bible as the holy book.