The survey actually confirms all previous studies that America is a very religious nation, with 73% listed in the believe in God category. A great majority of those fall in the absolutely certain subcategory while a small portion are only somewhat certain.
Here's how the bogus number was calculated:
15% Somewhat certain there is a God
11% Believe there is no God
16% Not sure whether or not there is a God
An accurate headline would be 42% of Americans not 'absolutely certain' God exists.
Here is the raw data:
Update: Drudge has now listed this bogus headline as one of the top stories of the day.