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Just for the fun of it, let me give a collection of quotes by Washington:
"Religion and morality are the essential pillars of civil society."
"Let it simply be asked where is the security for prosperity, for reputation, for life, if the sense of religious obligation desert the oaths, which are the instruments of investigation in the Courts of Justice."
"Let me conjure you in the name of our common country, as you value your sacred honor, as you respect the rights of humanity, and as you regard the military and national character of America, to express your utmost horror and detestation of the man who wishes, under any specious pretenses, to overturn the liberties of our country."
"Of all the dispositions and habits, which lead to political prosperity, Religion, and Morality are indispensable supports. -- In vain would that man claim the tribute of Patriotism, who should labor to subvert these great pillars of human happiness, these firmest props of the duties of Men and Citizens. -- The mere Politician, equally with the pious man, ought to respect and to cherish them. -- A volume could not trace all their connections with private and public felicity. -- Let it simply be asked where is the security for property, for reputation, for life, if the sense of religious obligation desert the oaths, which are the instruments of investigation in Courts of Justice? And let us with caution indulge the supposition, that morality can be maintained without religion. -- Whatever may be conceded to the influence of refined education on minds of peculiar structure -- reason and experience both forbid us to expect, that national morality can prevail in exclusion of religious principle." --George Washington, from his Farewell Address

"No people can be bound to acknowledge and adore the invisible hand which conducts the invisible affairs of men more than the people of the United States. Every step by which they have advanced to the character of an independent nation seems to have been distinguished by some token of providential agency.... We ought to be no less persuaded that the propitious smiles of heaven cannot be expected on a nation that disregards the eternal rules of order and right, which heaven itself has ordained." --George Washington

"It is rightly impossible to govern the world without God and the Bible." --George Washington
It is the duty of all nations to acknowledge the providence of Almighty God, to obey His will, to be grateful for His benefits, and humbly to implore His protection and favors." Thanksgiving Proclamation, October 3, 1789

"Statesmen, my dear Sir, may plan and speculate for Liberty, but it is Religion and Morality alone, which can establish the Principles upon which Freedom can securely stand." John Adams, Letter to Zabdiel Adams, June 21, 1776

"We have no government armed with power capable of contending with human passions unbridled by morality and religion...Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other." -John Adams {John Adams, The Works of John Adams, Second President of the United States, Charles Francis Adams, ed. (Boston: Little, Brown, 1854), Vol. IX, p. 401, June 21, 1776.}

"Suppose a nation in some distant region should take the Bible for their only law book, and every member should regulate his conduct by the precepts there contained! Every member would be obliged in conscience to temperance, frugality and industry; to justice, kindness and charity towards his fellow men; and to piety, love and reverence toward Almighty God." --John Adams

"The sacred rights of mankind are not to be rummaged for, among, old parchments, or musty records. They are written, as with a sun beam in the whole volume of human nature, by the hand of the divinity itself; and can never be erased or obscured by mortal power." Alexander Hamilton 1775

Benjamin Rush: "Without the restraints of religion and social worship, men become savages."

I could go on, but you should get the point by now.
America was founded as a non-sectarian Christian country.