I actually agree with Statler on the intelligence part. I know people more intelligent than I am that are believers. I tend to think its more personality than intelligence that decides how likely someone is to be religious.
As for atheists not knowing the Bible, I joke around a lot and use intentional hyperbole at times when talking about Christianity. That being said, I was a devout Christian for about 18 years and a conflicted one for another year or two. If I am being serious in a discussion about the Bible, I feel like I can pretty well explain why I feel certain ways about Scripture and such and not butcher what is actually being taught in the Bible. Trust me, I used to be very devout. So anything you want to ask me and have a serious conversation about, ask in here and Ill attempt to answer without hyperbole.