What are the first precepts of Christianity? That's an ill-defined concept. The ones they want in the courthouses are the Ten Commandments."The Declaration of Independence laid the cornerstone of human government upon the first precepts of Christianity".- John Adams
Consider this piece of Christian revisionism at http://tifwe.org/resources/moral-law-and-the-... entitled "Moral Law and the Ten Commandments"
"Once I was given a private tour of the United States House of Representatives. Our tour guide, the chief of staff for a congressman, had us go up and sit in the Speakers chair, look straight ahead, and tell him what we saw. Directly in front of us was a representation of Moses, whose writings were a primary basis for our rule of law. Although we might acknowledge the moral foundations of our nations laws, many believers are unclear about the place of biblical law in our personal and public life.
"The place of law in general, the influence of the Ten Commandments in particular, and the application of law to public life are all topics that provide an important framework for making wise decisions in our work and in economics. With this framework of uprightness and honesty, Christians and non-Christians alike are best equipped to love their neighbor and serve others through their work and business transactions."
Like the Adam's quote, that's simply incorrect. The Christian god would not have approved of America. It had no law instructing Americans to worship it. In fact, it guaranteed them the right not to. And there was no law forbidding the worship of idols, or of keeping the sabbath holy.