1) This country was not founded on Christian beliefs. Many of the founding fathers--BUT NOT ALL--were Christian, yes, but they based most of their plans for our country on Enlightenment era philosophers like John Locke and Thomas Hobbes. The words "God" or "Jesus" do not appear in the US Constitution, and in fact, the whole point of the opening nine words of the First Amendment were used to remind us that the government should stay out of religion--just as religion should stay out of government.
2) This country WAS founded, however, on the belief that all people are created equally and deserve certain rights. There are countless times in their correspondence with one another and in the Constitution when the fathers of our country discussed how the country should be free, filled with liberty, and equal rights should go to all. Of course, they didn't include "women" or "African-Americans" in their concept of "people"...but we've fixed their short-sightedness with the 13th, 14th, 15th, and 19th.
If you believe in equality and freedom, then you believe in America as the founding fathers envisioned.
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