Above all else, the document is NOT infallible, nor should it be inflexible per my examples.
Our Constitution makes no mention of God. The omission was too obvious to have been anything but deliberate, in spite of Alexander Hamilton's flippant responses when asked about it: According to one account, he said that the new nation was not in need of "foreign aid"; according to another, he simply said "we forgot." But as Hamilton's biographer Ron Chernow points out, Hamilton never forgot anything important.
In the eighty-five essays that make up The Federalist, God is mentioned only twice (both times by Madison, who uses the word, as Gore Vidal has remarked, in the "only Heaven knows" sense). In the Declaration of Independence, He gets two brief nods: a reference to "the Laws of Nature and Nature's God," and the famous line about men being "endowed by their Creator with certain inalienable rights." More blatant official references to a deity date from long after the founding period: "In God We Trust" did not appear on our coinage until the Civil War, and "under God" was introduced into the Pledge of Allegiance during the McCarthy hysteria in 1954 [see Elisabeth Sifton, "The Battle Over the Pledge," April 5, 2004].
In 1797 our government concluded a "Treaty of Peace and Friendship between the United States of America and the Bey and Subjects of Tripoli, or Barbary," now known simply as the Treaty of Tripoli. Article 11 of the treaty contains these words:
As the Government of the United States...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 document was endorsed by Secretary of State Timothy Pickering and President John Adams. It was then sent to the Senate for ratification; the vote was unanimous. It is worth pointing out that although this was the 339th time a recorded vote had been required by the Senate, it was only the third unanimous vote in the Senate's history. There is no record of debate or dissent. The text of the treaty was printed in full in the Philadelphia Gazette and in two New York papers, but there were no screams of outrage, as one might expect today.
The Founding Fathers were not religious men, and they fought hard to erect, in Thomas Jefferson's words, "a wall of separation between church and state." John Adams opined that if they were not restrained by legal measures, Puritans—the fundamentalists of their day—would "whip and crop, and pillory and roast." The historical epoch had afforded these men ample opportunity to observe the corruption to which established priesthoods were liable, as well as "the impious presumption of legislators and rulers," as Jefferson wrote, "civil as well as ecclesiastical, who, being themselves but fallible and uninspired men, have assumed dominion over the faith of others, setting up their own opinions and modes of thinking as the only true and infallible, and as such endeavoring to impose them on others, hath established and maintained false religions over the greatest part of the world and through all time."
If we define a Christian as a person who believes in the divinity of Jesus Christ, then it is safe to say that some of the key Founding Fathers were not Christians at all. Benjamin Franklin, Thomas Jefferson and Tom Paine were deists—that is, they believed in one Supreme Being but rejected revelation and all the supernatural elements of the Christian Church; the word of the Creator, they believed, could best be read in Nature. John Adams was a professed liberal Unitarian, but he, too, in his private correspondence seems more deist than Christian.
SOURCE: Our Godless Constitution, Brooke Allen, THE NATION, February 21, 2005 issue
Here is further evidence that God was not mentioned in the U.S. Constitution...
It has often been seen on the Internet that to find God in the Constitution, all one has to do is read it, and see how often the Framers used the words "God," or "Creator," "Jesus," or "Lord." Except for one notable instance, however, none of these words ever appears in the Constitution, neither the original nor in any of the Amendments. The notable exception is found in the Signatory section, where the date is written thusly: "Seventeenth Day of September in the Year of our Lord one thousand seven hundred and Eighty seven". The use of the word "Lord" here is not a religious reference, however. This was a common way of expressing the date, in both religious and secular contexts. This lack of any these words does not mean that the Framers were not spiritual people, any more than the use of the word Lord means that they were. What this lack of these words is expositive of is not a love for or disdain for religion, but the feeling that the new government should not involve itself in matters of religion. In fact, the original Constitution bars any religious test to hold any federal office in the United States.