You simply don't understand that the Bible is not translated from previous Bibles, or as part of some process of evolution of translation changing the text being translated each time.
The Masoretic Texts and the Septuagint that form the basis of most translations is still used today, modern knowledge, new discoveries such as the Dead Sea Scrolls and a greater understanding of Koine, Hebrew and Aramaic mean that a Bible translation today is far more accurate than one before, it is not a case of an ever decreasing knowledge base, but an ever increasing one.
The Latin Vulgate dates far earlier than 800AD, don't confuse the Illuminated Book of Kells with being the first Bible, It is based largely on the Vulgate and the Vetus Latina, both of which are 500 years earlier than the Illuminated Gospel Book written in 800AD.
The Septuaquint dates back to the 3rd Century AD and is the basis for the Vulgate, there are also various texts and fragments of texts that Support the accuracy of the later Masoretic texts as well as the aforementioned Dead Sea Scrolls found at Qumran which date as far back as the 1st and 2nd centuries as well as many, many others that need not be mentioned here.
This is why your assertion that the words have been altered so much as to be unrecognisable from the originals is simply not correct, translations are not always exact or correct, but to say they are completely different or that a book such as Harry Potter could be subjected to the same process and be altered so that it becomes the basis of a religion is simply wrong and no offence but you do not know enough about the translation process and the huge body of texts and linguistic science applied to make such a judgement.