this book is intresting, not created by the "devil"
but probably a monk by the name of herman the reclouse.
it is estimated the to write this continuosly it would take around 5 years of 24hour a day writting but with his other dutoes i.e prayer etc it would have take him around 35 years to complete, it was thought it was a team of scholars that completed it but because the ink is mage from insects and not iron it points at one mans work, also it is "amature" it looks awesome to us, but back then it is classed as amature, like a very early nerd had a lot of time to complete something. the page with the full page devil picture was puzzling why would this be in a "bible" but on the opposite page is a picture of the kingdom of heaven, so when the book is closed the face each other good v evil, so close togther,
this is my take on it anyway, hope it was useful.