If by "a single sentence written to a foreign leader" you mean Jefferson's "high wall of separation between Church and state", it wasn't written to a foreign leader. It was written to persecuted Christians right here at home. Baptists in Connecticut were being persecuted by Congregationalists (a historical detail the Southern Baptist convention tends to overlook these days).
. As far as folks being sworn in on Bible, remember the Constitution gives the option of affirmation for those who refuse to take an oath. Lets also remember that both John Q. Adams and Franklin Pierce took the oath on books of law, not Bibles. There is a lot of conservative evangelical historical revisionism going on about how Christian this country was, and a lot more about ignoring how the Christians were often at each other's throats to the point of seriously persecuting each other. The religious right's picture of a sunny conservative Christian solidarity coming under attack by godless liberals starting in the 1960s is a load of hooey.
FQ13
So, when George Washington declared a National Day of Prayer for the day after his inauguration, that was what, just a figment of our historical imaginations?
No one is arguing against the notion that there were different flavors of Christians, rationalists, "Liberals" (as you often lecture us), atheists and even - gasp! - Jews at the formation of this country. However, to deny the religious - and that means overwhelmingly some flavor of Christian - foundations of this country is an exercise in foolishness. You can spin the facts, quote any obscure tome or letter, but the overwhelming truth is that these men were religious to one degree or another, basing their religious nature in their Judeo-Christian education. Not wiccan, not mooslim, not buddhist, none of the above.
Go look up "Cynic" in Bierce's
Devil's Dictionary - your picture is right there next to the definition! You have all of the facts, none of the wisdom.