A study of President John Adams’ private and public statements show that he believed that Christianity must be rooted within the nation’s culture in order for the nation to survive. Adams expressed his religious views on numerous occasions, but his call for a National Fast Day on March 6, 1799, is the most expressive:
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 growing 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 of individuals and to the well-being of communities…. I have thought proper to recommend, and I hereby recommend accordingly, that Thursday, the twenty-fifth 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 occupation, and 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” [Prov. 14:34]. The “Great Mediator and Redeemer” is Jesus Christ.
On another occasion, John Adams wrote to Thomas Jefferson stating, “The general principles, on which the Fathers achieved independence, were … the general principles of Christianity.” A few years later Adams wrote a letter to Jefferson in which he stated that “Without religion this world would be something not fit to be mentioned in polite society, I mean hell.” (Gary DeMar, America’s 200 Year War Against Terror, pp. 11-13)