I highly recommend that you take a look at this week's issue of Time (Nov. 26, 2007) which has a special feature based on a recent Census study of the typical day in the life of an average American. The Time staff has done a great job of reducing a lot of complex data into a beautiful set of graphics. You can click here and see the feature on line, but it would be worth it to go get a hard copy if you don't regularly receive this magazine. These are data you can use again and again.
"The vast majority of Americans believe in God, and more than 90% own a Bible, but only half can name a single Gospel, and 10% think Joan of Arc was Noah's wife. So what's the average state of our eternal souls?"