Sir William Blackstone wrote in his Commentaries on the Laws of England

"In the name of God, Amen. We whose names are underwritten, the loyall subjects of our dread soveraigne Lord, King James, by the grace of God, of Great Britaine, France, and Ireland king, defender of the faith, etc.
Haveing undertaken for the gloire of God, and advancements of the Christian faith, and honour of our king and countrie, a voyage to plant the first colonie in the Northerne parts of Virginia, doe by these presents solemnly and mutualy in the presence of God, and one of another, covenant and combine ourselves togeather into a civil body politick, for our better ordering and preservation and furtherance of the ends aforesaid; and by virtue hearof to enacte, constitute, and frame such just and equall lawes, ordinances, acts, constitutions, and offices, from time to time, as shall be thought most meete and convenient for the generall good of the colonie, unto which we promise all due submission and obedience. In witness whereof we have hereunder subscribed our names at CapCodd the 11 of November, in the year of the raigne of our soveraigne Lord, King James of England, France, and Ireland the eighteenth, and of Scotland the fiftie fourth. Anno Dom. 1620."

The Mayflower Compact, November 11, 1620
 

Those who will not be governed by God, will be ruled by tyrants.

William Penn

Our ancestors established their system of government on morality and religious sentiment. Moral habits, they believed, cannot safely be trusted on any other foundation than religious principle, nor any government be secure which is not supported by moral habits. Living under the heavenly light of revelation, they hoped to find all the social dispositions, all the duties which men owe to each other and to society, enforced and performed. Whatever makes men good Christians, makes them good citizens.

Daniel Webster

If we abide by the Bible our country will go on prospering and to prosper, but if we or our posterity neglect its instructions and authority, no man can tell how sudden a catastrophe may overwhelm us and bury our glory in profound obscurity!

Daniel Webster

Almost all civil liberty now enjoyed in the world owes its origin to the principles of the Christian religion.

Noah Webster (1758-1843) in his History of the United States

Every thinking man, when he thinks, realizes that the teachings of the Bible are so interwoven and entwined with our whole civic and social life that it would be literally - I do not mean figuratively, but literally - impossible for us to figure what that loss would be if these teachings were removed. We would lose almost all the standards by which we now judge both public and private morals; all the standards towards which we, with more or less of resolution, strive to raise ourselves.

Theodore Roosevelt

The American Revolution was preceded by the great religious revival of the middle of the eighteenth century, which had its effect both in England and in the colonies. When the common people turned to the reading of the Bible . . . when they were stirred by a great revival . . . the way was prepared . . . It was because religion gave the people a new importance and a new glory that they demanded a new freedom and a new government. We cannot in our generation reject the cause and retain the result.
If the institutions they adopted are to survive, if the governments which they founded are to endure, it will be because the people continue to have similar religious beliefs. It is idle to discuss freedom and equality on any other basis. It is useless to expect substantial reforms from any other motive. They cannot be administered from without. They must come from within. That is why laws alone are so impotent. To enact or to repeal laws is not to secure real reform. It is necessary to take these problems directly to the individual . . . There will be obedience to law when the individual feels that government represents a divine authority.
It is these beliefs, these religious convictions, that represent the strength of America, the strength of all civilized society . . . It is righteousness alone which exalteth the nation . . .

President Calvin Coolidge

Quotes taken from:
Hicks, Laurel, ed., et.al. American Government &
Economics in Christian Perspective.
A Beka Book Publication; Pensacola, Florida, 1984.