AP Photo

A new study showing that most Tea Partiers say America is a "Christian nation" has reignited an age-old argument about our nation's roots. Traditionally, the debate has been polarized with social conservatives like Fox News host Glenn Beck claiming our country was founded as a sacred Christian nation and left-leaning thinkers asserting that America was and should stay a non-religious country. Proponents of both views can drum up quotes by historical figures to support their position.

Recently, however, a third way has emerged among a surprising demographic: younger Christians. In the last three years, I've conducted hundreds of interviews and focus groups with the next generation of Christian leaders and found a new view that threads the needle between the left...