Christians [best] ignore national matters; and "not be involved with them in any way, not even by writing about them". For they're dead "wrong to want the United States to 'reflect Christian morality and beliefs [or, for that matter] any [other] morality and beliefs ... [not even] amoral[ity; and] that all people, including officials of the American government, should conduct themselves according to Christian principles of justice and righteousness". Such Christians, see, are spiritually unstable for believing outside belief, and so playing with the false belief, that the "Founding Fathers and social reformers who were not Christians ... have appealed to [Christ-centered gospels, epistles and revelation] as an authority.
(1) "Our justice system deal with [me always, always, always] without [Christ-centered] morality"!
(2) "When a president makes decisions about war and peace, [I do] prefer that he do so without [Christ-centered] morality"!
(3) "What the prophets of the Old Testament preferred" could only be "morality" as predetermined by the so-called Law of Moses, for they remained clueless as to "[Christ-centered] morality" until He came!
(4) It was only in the name of "morality" according to the Law of Moses - but never according to the Grace of God in THE Christ Jesus of the gospels, epistles and revelation - did "any of them [OT prophets] condemn the rulers of foreign nations for their immoral conduct"! (Not so, however, in the case of NT prophets, whose situation vis-a-vis the Christ Jesus, have radically changed.)