My 18 year old and I had a similar discussion the other night about the bible surviving, M's take on that was that of some humans needing a guide to make it through life, and as has been said there are some "infected" with a desire to keep the god of the book alive, and as M said that god is interpreted in many forms and fashions, some evil some good. Some humans in this endless quest to make a "purpose or reason" for their existence keep their version of this god alive. Keep rolling out the bibles, and as some thinking ones see a need to prove those other thinkers wrong! they come up with there own take on the whole concept.... "as in, look how many dates have been set by for destruction* armageddon* not just by jw's (I might add.)
Boils down to what I think, a lot of it is man made.