While there may be some basic parallels between the foundation of the U.S. government and biblical law (you know, be nice to people, don't kill, don't steal -- standard moral values found in most religions) this country was most demonstrably not founded on biblical law.

The First Amendmant reads:

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof

Moreover, in a treaty with Tripoli drafted under George Washington, ratified by the Senate under Adams in 1797, our first president wrote:

As the Government of the United States of America is not, in any sense, founded on the Christian religion; as it has in itself no character of enmity against the laws, religion, or tranquility, of Musselmen; and as the said States never have entered into any war or act of hostility against any Mehomitan nation, it is declared by the parties that no pretext arising from religious opinions shall ever produce an interruption of the harmony existing between the two countries.

This is America's foundation. It is separation of Chuch and State, the very thing those who had fled England were trying to escape. To insist that the U.S. is somehow (or for that matter ever was) a Christian nation is historically false. Indeed, this is so far removed from the truth as to be the polar opposite of what America stood for in its dawning days - and still stands for in the current era we now live in.