A major survey by the Pew Research Center's Forum on Religion &Here's an article that emphasizes the political findings in the report:
Public Life finds that most Americans have a non-dogmatic approach to
faith. A majority of those who are affiliated with a religion, for
instance, do not believe their religion is the only way to salvation.
And almost the same number believes that there is more than one true
way to interpret the teachings of their religion. This openness to a
range of religious viewpoints is in line with the great diversity of
religious affiliation, belief and practice that exists in the United
States, as documented in a survey of more than 35,000 Americans that
comprehensively examines the country’s religious landscape.