As one person commented on here, this was a test not about Christianity, but religion in general. Thus while Evangelicals might have a greater degree of knowledge about the Bible, they tend to know much less about other religions.
Well I managed to track down a version of the quiz. The Pew Forum has 15 of the 32 questions available for you to try. You can also compare your results with others who took the quiz. I took the quiz and got one wrong. And no, it was not a question about the Bible.
Take the quiz and let me know your score.