"A Purpose Driven Life"

According to Mitt Romney, A Purpose Driven Life refers to those who do not have faith.

This contradicts the definition used by Rick Warren in his book of the same name.
http://www.google.com/search?hl=en&q=%22purpose+driven+life%22

February 7, 2008:
http://thepage.time.com/transcript-of-romneys-speech-withdrawing-from-the-race/