As no truth is more clearly taught in the Volume of Inspiration, nor any more fully demonstrated by the experience of all ages, than that a deep sense and a due acknowledgment of the governing providence of a Supreme Being and of the accountableness of men to Him as the searcher of hearts and righteous distributer of rewards and punishments are conducive equally to the happiness and rectitude of individuals and to the well-being of communities;
as it is also most reasonable in itself that men who are made capable of social acts and relations, who owe their improvements to the social state, and who derive their enjoyments from it, should, as a society, make their acknowledgments of dependence and obligation to Him who hath endowed them with these capacities and elevated them in the scale of existence by these distinctions;
as it is likewise a plain dictate of duty and a strong sentiment of nature that in circumstances of great urgency and seasons of imminent danger earnest and particular supplications should be made to Him who is able to defend or to destroy;
as, moreover, the most precious interests of the people of the United States are still held in jeopardy by the hostile designs and insidious acts of a foreign nation, as well as by the dissemination among them of those principles, subversive of the foundations of all religious, moral, and social obligations, that have produced incalculable mischief and misery in other countries;
and as, in fine, the observance of special seasons for public religious solemnities is happily calculated to avert the evils which we ought to deprecate and to excite to the performance of the duties which we ought to discharge by calling and fixing the attention of the people at large to the momentous truths already recited, by affording opportunity to teach and inculcate them by animating devotion and giving to it the character of a national act:
For these reasons I have thought proper to recommend, and I do hereby recommend accordingly, that Thursday, the 25th day of April next, be observed throughout the United States of America as a day of solemn humiliation, fasting, and prayer; that the citizens on that day abstain as far as may be from their secular occupations, devote the time to the sacred duties of religion in public and in private; that they 
- call to mind our numerous offenses against the Most High God, confess them before Him with the sincerest penitence,
- implore His pardoning mercy, through the Great Mediator and Redeemer, for our past transgressions,
- and that through the grace of His Holy Spirit we may be disposed and enabled to yield a more suitable obedience to His righteous requisitions in time to come;
- • that He would interpose to arrest the progress of that impiety  and licentiousness in principle and practice so offensive to Himself and so ruinous to mankind;
- • that He would make us deeply sensible that "righteousness exalteth a nation, but sin is a reproach to any people;" [Proverbs 14:34]
- • that He would turn us from our transgressions and turn His displeasure from us;
- • that He would withhold us from unreasonable discontent, from disunion, faction, sedition, and insurrection;
- • that He would preserve our country from the desolating sword;
- • that He would save our cities and towns from a repetition of those awful pestilential visitations under which they have lately suffered so severely, and that the health of our inhabitants generally may be precious in His sight;
- • that He would favor us with fruitful seasons and so bless the labors of the husbandman as that there may be food in abundance for man and beast;
- • that He would prosper our commerce, manufactures, and fisheries, and give success to the people in all their lawful industry and enterprise;
- • that He would smile on our colleges, academies, schools, and seminaries of learning, and make them nurseries of sound science, morals, and religion;
- • that He would bless all magistrates, from the highest to the lowest, give them the true spirit of their station, make them a terror to evil doers and a praise to them that do well;
- • that He would preside over the councils of the nation at this critical period, enlighten them to a just discernment of the public interest, and save them from mistake, division, and discord;
- • that He would make succeed our preparations for defense and bless our armaments by land and by sea;
- • that He would put an end to the effusion of human blood and the accumulation of human misery among the contending nations of the earth by disposing them to justice, to equity, to benevolence, and to peace;
- • and that he would extend the blessings of knowledge, of true liberty, and of pure and undefiled religion throughout the world.
And I do also recommend that with these acts of humiliation, penitence, and prayer fervent thanksgiving to the Author of All Good be united for the countless favors which He is still continuing to the people of the United States, and which render their condition as a nation eminently happy when compared with the lot of others.
BY THE PRESIDENT OF THE UNITED STATES OF AMERICA.
[From C. F. Adams's Works of John Adams, Vol. IX, p. 172.]
Messages and Papers of the Presidents, John Adams, vol. 1, p.274-76
Now consider a more contemporary "American Prayer":
YouTube - My American Prayer - Dave Stewart (Captioned)
Are the singers, dancers, and political groupies in this video (and the lifestyles they represent) the creators of
• industrial civilization,
• the science and technology in our health care system,
• our computers, and
• the productivity of our economy,
or are they merely the beneficiaries of this labor and of "the Protestant Work Ethic?"
Which America has a future?
Which God do you believe can bring salvation to America: the God of John Adams, or the god, Barack Obama?
Some have suggested that Adams was a Unitarian who doubted the divinity of Christ. Yet his official acts as President were Trinitarian. Legal effect is determined objectively, not subjectively.
Piety, in principle, is a compound of veneration or reverence of the Supreme Being and love of his character, or veneration accompanied with love; and piety in practice is the exercise of these affections in obedience to his will and devotion to his service.
Noah Webster, Dictionary of American English, 1st ed., 1828.