When I need to get an epub file ‘validated’ that can be a rigourous process going over the code involved. Philosophers like to be very careful with the use of language and what it means. many have pointed out that some philosophical problems are actually language meaning problems, rather than things-in-themselves. Comparing the ‘validity’ of the Biblos (little books) with the Quran would require defining validity and agreement on a truth theory I suppose, first, before comparing historical data. If you look at my free ebook that is a commentary on Berkhof’s Introduction to the New Testament, you would see some of the meticulous work Berkhof did and examining the gospel books. One can do that for the Quran too, and learn what references in it compare with those of the Bible.