Brian

“The government of the United States is not, in any sense, founded on the Christian religion.”
― John Adams

“As the Government of the United States of America is not, in any sense, founded on the Christian religion,—as it has in itself no character of enmity against the laws, religion, or tranquility, of Mussulmen [Muslims],—and as the said States never entered into any war or act of hostility against any Mahometan [Mohammedan] nation, it is declared by the parties that no pretext arising from religious opinions shall ever produce an interruption of the harmony existing between the two countries.

[Adams submitted and signed the Treaty of Tripoli, 1797]”
― John Adams, Thoughts on government applicable to the present state of the American colonies.: Philadelphia, Printed by John Dunlap, M,DCC,LXXXVI.

“I believe in an America where the separation of church and state is absolute - where no Catholic prelate would tell the President (should he be Catholic) how to act, and no Protestant minister would tell his parishioners for whom to vote - where no church or church school is granted any public funds or political preference - and where no man is denied public office merely because his religion differs from the President who might appoint him or the people who might elect him.

I believe in an America that is officially neither Catholic, Protestant nor Jewish - where no public official either requests or accepts instructions on public policy from the Pope, the National Council of Churches or any other ecclesiastical source - where no religious body seeks to impose its will directly or indirectly upon the general populace or the public acts of its officials - and where religious liberty is so indivisible that an act against one church is treated as an act against all.

[Remarks to the Greater Houston Ministerial Association, September 12 1960]”
― John F. Kennedy

“The purpose of separation of church and state is to keep forever from these shores the ceaseless strife that has soaked the soil of Europe in blood for centuries.

[Letter objecting to the use of government land for churches, 1803]”
― James Madison