THe founding fathers were mostly Deist, not Christian. Also, many of them were strongly opposed to the church that you so dearly love. Here are some more interesting Washington quotes...
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If I could conceive that the general government might ever be so administered as to render the liberty of conscience insecure, I beg you will be persuaded, that no one would be more zealous than myself to establish effectual barriers against the horrors of spiritual tyranny, and every species of religious persecution.
-- George Washington, letter to the United Baptist Chamber of Virginia, May 1789, in Anson Phelps Stokes, Church and State in the United States, Vol 1. p. 495, quoted from Albert J Menendez and Edd Doerr, The Great Quotations on Religious Freedom
Every man, conducting himself as a good citizen, and being accountable to God alone for his religious opinions, ought to be protected in worshipping the Deity according to the dictates of his own conscience.
-- George Washington, letter to the United Baptist Chamber of Virginia, May 1789, in Anson Phelps Stokes, Church and State in the United States, Vol 1. p. 495, quoted from Albert J Menendez and Edd Doerr, The Great Quotations on Religious Freedom
I am persuaded, you will permit me to observe that the path of true piety is so plain as to require but little political direction. To this consideration we ought to ascribe the absence of any regulation, respecting religion, from the Magna-Charta of our country.
-- George Washington, responding to a group of clergymen who complained that the Constitution lacked mention of Jesus Christ, in 1789, Papers, Presidential Series, 4:274, the "Magna-Charta" here refers to the proposed United States Constitution
The Citizens of the United States of America have a right to applaud themselves for having given to mankind examples of an enlarged and liberal policy: a policy worthy of imitation. All possess alike liberty of conscience and immunities of citizenship It is now no more that toleration is spoken of, as if it was by the indulgence of one class of people, that another enjoyed the exercise of their inherent natural rights. For happily the Government of the United States, which gives to bigotry no sanction, to persecution no assistance requires only that they who live under its protection should demean themselves as good citizens, in giving it on all occasions their effectual support.
-- George Washington, letter to the congregation of Touro Synagogue, Newport, Rhode Island, August, 1790, in Anson Phelps Stokes, Church and State in the United States, Vol 1. p. 862
Of all the animosities which have existed among mankind, those which are caused by a difference of sentiments in religion appear to be the most inveterate and distressing, and ought to be deprecated. I was in hopes that the enlightened and liberal policy, which has marked the present age, would at least have reconciled Christians of every denomination so far that we should never again see the religious disputes carried to such a pitch as to endanger the peace of society.
-- George Washington, letter to Edward Newenham, October 20, 1792, quoted from Albert J Menendez and Edd Doerr, The Great Quotations on Religious Freedom, also James A Haught, 2000 Years of Disbelief
We have abundant reason to rejoice that in this Land the light of truth and reason has triumphed over the power of bigotry and superstition ... In this enlightened Age and in this Land of equal liberty it is our boast, that a man's religious tenets will not forfeit the protection of the Laws, nor deprive him of the right of attaining and holding the highest Offices that are known in the United States.
-- George Washington, letter to the members of the New Church in Baltimore, January 27, 1793, in Anson Phelps Stokes, Church and State in the United States, Vol 1. p. 497, quoted from Albert J Menendez and Edd Doerr, The Great Quotations on Religious Freedom
If they are good workmen, they may be of Asia, Africa, or Europe. They may be Mohometans, Jews or Christians of any Sect, or they may be Atheists.
-- George Washington, letter to Tench Tilghman asking him to secure a carpenter and a bricklayer for his Mount Vernon estate, March 24, 1784, in Paul F Boller, George Washington & Religion (1963) p. 118, quoted from Ed and Michael Buckner, "Quotations that Support the Separation of State and Church"
Among many other weighty objections to the Measure, it has been suggested, that it has a tendency to introduce religious disputes into the Army, which above all things should be avoided, and in many instances would compel men to a mode of Worship which they do not profess.
-- George Washington, to John Hancock, then president of Congress, expressing opposition to a congressional plan to appoint brigade chaplains in the Continental Army (1777), quoted from a letter to Cliff Walker from Doug Harper (2002)
I had always hoped that this land might become a safe and agreeable Asylum to the virtuous and persecuted part of mankind, to whatever nation they might belong.
-- George Washington, letter to Francis Adrian Van der Kemp, a Mennonite minister, May 28, 1788, in Paul F Boller, George Washington & Religion (1963) p. 118, quoted from Ed and Michael Buckner, "Quotations that Support the Separation of State and Church"
Government being, among other purposes, instituted to protect the consciences of men from oppression, it certainly is the duty of Rulers, not only to abstain from it themselves, but according to their stations, to prevent it in others.
-- George Washington, letter to the Religious Society called the Quakers, September 28,1789, quoted from Albert J Menendez and Edd Doerr, The Great Quotations on Religious Freedom, also in Gorton Carruth and Eugene Ehrlich, The Harper Book of American Quotations (1988)