NPR's Hagerty's narrow view of "Christian values"

USA: "In a May 5 report about religious conservatives who believe that separation of church and state is inconsistent with the principles espoused by the country's founders, National Public Radio (NPR) religion correspondent Barbara Bradley Hagerty concluded by intoning: 'While many Americans may travel a middle road, they are caught in the crossfire between those who believe that asserting Christian values is the greatest hope for America's future and those who see it as a threat.'

"Hagerty appeared to have learned nothing from her own report, on Morning Edition, which illustrated that many believe that a clear delineation between church and state is a Christian value."
Source: MediaMatters

Was the USA founded on Christianity?