Hmm, what an interesting topic you got there. It could be possible that the devil deceived us and the thing we know might not be true, but for me it's impossible for the devil to throw God away from the heaven. It might be possible that the devil just removed some important details in the bible that God have put there but the devil might not remove all of the bible since it would be very suspicious or he can't do it because of God's protection to bible or whatsover. I believe though that god was true and maybe the killings, evil and hatred in the world is out of God's control, after all he gave humans free will and that's where the devil get into, to interfere with humans will.
Why not? How can you know, think that everything you know about god is false and untrue, all lies and made up stories so you dont stand against god or in this case the devil (that took gods place). That's why he's been showing his power in the legends with the flood, sodoma and gomora, etc... showing us through those "made up" stories about mass destruction so the people fear him and not try going against him... you know what I mean.