Nevertheless, because the revolutionary leadership sprang from the social establishment in several colonies, it included many who were Anglicans by denominational loyalty, no less than two-thirds of the signatories of the Declaration of Independence. Elite egalitarians tended to lead these Founding Fathers not to the Awakening but to the Enlightenment and Deism: cool versions of Christianity, or virtually no Christianity at all. The polymath Benjamin Franklin seldom went to church, and when he did, it was to enjoy the Anglican Book of Common Prayer decorously performed in Christ Church, Philadelphia; he made it a point of principle not to spend energy affirming the divinity of Christ. Thomas Jefferson was rather more concerned than Franklin to be seen at church on key political occasions, but he deplored religious controversy, deeply distrusted organized religion and spoke of the Trinity as 'abracadabra...hocus-pocus...a deliria of crazy imaginations, as foreign to Christianity as that of Mohamet'. In the face of such low-temperature religion, many on the present-day American religious right, anxious to appropriate the Revolution for their own version of modern American patriotism, have sought comfort in the ultimate Founding Father, George Washington, but here too there is much to doubt. Washington never received Holy Communion, and was inclined in discourse to refer to providence or destiny rather than God.From Christianity: The First Three Thousand Years by Diarmaid MacCullough, pp. 763-764.
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What this revolutionary elite achieved amid a sea of competing Christianities, many of which were highly uncongenial to them, was to make religion a private affair in the eyes of the new American federal government. The constitution which they created made no mention of God or Christianity (apart from the date by 'the Year of our Lord'). That was without precedent in Christian polities of that time, and with equal disregard for tradition (after some debate), the Great Seal of the United States of America bore no Christian symbol but rather the Eye of Providence, which if it recalled anything recalled Freemasonry. The motto 'In God We Trust' only first appeared on the American coin amid civil war in 1864, and it was 1957 before it featured on any paper currency of the United States.
So much for the United States as a 'Christian' nation established by 'Christian' Founding Fathers. Citizens who do not know the true history of the country make up from whole cloth a false history to suit their individual purposes.
You may find this hard to believe, but during all my years in elementary and high school, I said the Pledge of Allegiance minus the words 'under God' and, I came out of that period of my life unscathed. The words were added in 1954, during my university years.
Further reading on the subject of the 'Christian' Founding Fathers in a splendid article in the Pittsburgh Post-Gazette on the religious views of George Washington, John Adams, Thomas Jefferson, James Madison, and Thomas Paine, none of whom would be electable today.