You could anything from George Washington's farewell address (http://www.earlyamerica.com/earlyamerica/milestones/farewell/ ) to Thomas Jefferson's FULL letter re separation of Church and State (http://www.loc.gov/loc/lcib/9806/danpre.html ), or the writings of Founding Fathers like Noah Webster, Benjamin Rush, or golly ANY signer of the Declaration of Independence (http://www.ushistory.org/DECLARATION/signers/index.htm ) and get the picture that "separation of Church and State"...to THEM...at all times and into the infinite future BY them was conceived of as ONLY the Federal government could NOT establish or respect one denomination over others (as was and is the practice under the Church of England, or Anglicans, started by Henry VIII as its head and continuing to date with QEII as head).

That is, the Founding Fathers easily thought religion and its objective morality were the surest guardians of freedom, liberty, personal growth and responsibility for ANY nation...they just didn't believe it was government's job or place to set up a new one like England had, or even proclaim one orthodoxy for one or any or all.

The first ever Supreme Court variance to this came in 1962, when the famously political Earl Warren Court not only invented new rights and entitlements, it truncated Jefferson's letter to the sentence about a separation of Church and State and on such "ground" commanded that religion and government must operate by completely different ideals.

Now, to be sure, at that point in history the Federal and most State governments were first-ever converting from common law...where prosecutors/police ex rel or upon inquiry by their own reasoning found offenses for trial by Juries...to statutes of civil and criminal procedure, where a statute has to spell out a remedy or offense, if no statute exists neither does duty or relief, and each and every part of a statute must be proven or the whole case fails. All this fuzziness seemed needed at a time America was geared up for the Great Cold War, out to disprove Kommissars and  Presidentes De Por Vida who claimed capitalism...not strongmen... stifled rights and demanded locked-down nihilism of "the masses". Remember, that was the time of Federal Regulation of everything (ended together with defense bases by Reagan 1985) so that no matter what it took only the most recalcitrant among us couldn't make it regardless of creed, color, or national origin.

It seems...in the absence of political will or spine to continue the "Warren Anime"...today's pols and officials transcend even a separation of Church and State not on the Warren Court's propaganda, but by a "modern" concept that if so many leaders around the world call ALL religion psychology, government must control all of it. No, we lilliputians only THINK Scalia and Kagan types actually want the same kind of power Committees of 100 or Politburos have over folks being in or entering their borders...see, USA pols high, low, and petty all hold THEIR reason is sure something superior to humans created everything, there's just "no evidence" that this power wants ANY religion to spring up, be practiced, or has otherwise spoken to humanity this side of eternity...otherwise, see, they'd carry on Washington's view of religious benefits and at least spare mere objective suggestions and analysis of autonomous facts from being "of interest or potential harm to government initiatives and policies"; why, many might even stop saying Church meetings "hurt sales tax revenue" and what have you.

So religious people, keep working on proofs your Deity or equivalent has set forth for us all peaceful, reasoned ways for continuing positively through eternity.

As a true Conservative and not mere "culture-vulture", on this Fourth of July in the spirit of Acts 10:34 I would like to salute all people of earth...no matter their position or status or location...who persevere pro bono publicum under reasoned religion, non-religious reasoned public and private service, or any other sane ways. Your efforts show that even though nations deserve to be autonomous, we could again indeed produce a world wherein responsible creative individualism (from where we find ourselves) makes the world a rich quilt woven by the human spirit under some Creator's aegis.