User blog comment:ImperiexSeed/Supernatural Mysteries/@comment-6449959-20130212215814/@comment-1509826-20130212220340

Um, Lucifer did create demons, Metaron is gods scribe, the tablets were created as a warning to help man incase these things ever turned on us. Lucifer did create the first demons, but god created lucifer, and he also created the souls lucifer broke into demons.

Second, its unknown but I agree it has to be B, but then, as he was mearly dictating from God, its not imposible for him to be talking about things that don't exist, he is all knowing and all.

Reading the tablet is the same as reading, Kevin mearly has the factalties to translate the tablet, he isn't fluent in the language its written in, much like how real researchers have to translate ancient archelogical tablets he has to. If I'm misreading the the question, and your asking why he is required to read the tablet, its his job as prophet, he's the only one (other than) Metatron who can read it, no one else can, not even angels or demons.