Was America founded on Christianity?

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Many people believe that this country was based on Christianity, but by reading history I know at least something called: Separation of church and state. What's more, I found this from the movie "Religulous":

Thomas Jefferson: "Christianity is the most perverted system that ever shone on man."

Benjamin Franlin: "Lighthouses are more useful than churches. "

John Adams: "This would be the best of all possible worlds if there were no religion in it! "

Is this all about the perspective?
However, it is true to say that American people live in a Christian community. And I do believe that's what makes this country's ideology relatively behind even though the economic, scientific and social system are absolutely advanced.

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