I'd agree (though I suspect Ms Dunbar would not). However, my understanding is that the biggest influence the Judeo-Christian tradition had on the foundation of the United States was the horror of European religious divisions. Therefore, the Founding Fathers -whilst men of Christian faith and morals - took steps to ensure freedom of religion.
It is true that they saw this as freedom of Christian conscience but when the more extremist religious proponents rise up to proclaim the US a "Christian" country, they tend to assume a monolithic Christianity (specifically theirs). Thus Roman Catholics or other denominations which have no truck with creationism, for example, do not seem to be included.
The founders of the United States knew all about Christian schism and how it nearly destroyed the Europe their forefathers had fled from. Sadly, the religious fundamentalist persuasion is exactly contrary to the very freedom of conscience that allowed America to bloom.
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