In my way of thinking, I don't think the Bible in and of itself is going to make anyone become an atheist unless there is at least a seed of doubt already there. Most people that read the Bible are looking for validation for their faith and confirmation that their god is the true inspiration for its writing. Most of them are so blinded by the need to keep believing that they do not understand that many events told of in the "good book" are atrocities instead of the actions of a loving god taking care of "his people" that they think they are. They just gloss over those parts and think "Wow, what a powerful being God must be."
Until someone delves into the Bible with an open mind and eyes wide open can the Bible turn them away from Christianity. After all, if they weren't so blinded by faith, they would realize that the holy books of other religions are thought by their adherents to be the true word of god just as much as Christians think the Bible is. Everybody can't be right.
This is the thing that really got me to thinking about religion in general a long time ago. If Christianity was the one true and indisputable religion that Christians think it is, why are there other religions. Obviously, the Bible isn't as confirmed as they like to think it is.