First off, this is an almost textbook example of a poorly-written survey that does not actually answer the question asked, even though it does give some interesting data. Kiddiewinks, spend more time in the design phase! (I’m always telling my students this in various classes, and here I am not doing it. I hang my head in shame).
Some friends of mine and I were discussing religion when one of them mentioned that he had never met a single self-identified Christian who had read the entire Bible. I found that such an odd thing to say, since we were both reared in the same denomination and the practice was encouraged in the church I attended as a youngster, that I started asking around. The answers I got became a little complex, so I designed this rather simplistic survey. Unfortunately, as designed, it cannot answer the question originally discussed: Is it really unusual for Christians to read the Bible cover to cover?
Even though it doesn’t fulfill the original intent, the answers are interesting nonetheless. It does seem a lot of non-Christians have indeed read the entire Bible.