He misread the table (
http://www.nsf.gov/sbe/srs/seind02/append/c7/at07-10.pdf). The percentages are for those providing the correct answer to the questions, not for those answering "yes".
Scarier is the misconceptions of the test constructors. True-or-false question H is, "The universe began with a huge explosion." One of the first misconceptions people have to be disabused of when they discuss cosmic origins here is that it wasn't so much an explosion as an expansion.
--Percy