Have you ever looked at the US Supreme Court building?
Among others, it has a figurine representing, surpise, Muhammad!
Yes, the US was founded as a nation with Religion being separated from the State.
The reasons were many, but one prominent one was that Christianity itself wasn't a single faith- it was/is a collection of various feuding sects, with the feuds often being very violent. The first immigrants to the US fled their homeland on account of these feuds. This is what the Founding Fathers recognised, and realized the utter importance of removing Religion from what constituted the State.
And all those philosophers and religous men of the world are looking to one figure in the center. Who is that?
Moses holding the 10 Commandments.
There is no question that this nation was founded upon the Law and Justice of the God of Israel, and Christianity in particular.
This is what the Founding Fathers recognised, and realized the utter importance of removing Religion from what constituted the State.
When the original draft of the Establishment clause prevented the States as well as the Federal government from any establishment of religion, the clause was not ratified. It was not ratified until the CONGRESS ALONE was prevented. That in and of itself proves their intention, not to mention centuries of British common law and over a century of American precedence confirming the same.
What you proffer is a libertine idea, and wholly foreign to our founding, and our history. Our system simply cannot work without a firm and established Judeo-Christian ethic, in which, and for which, our Constitution was written.
As you readily admit, it was designed to accommodate the various denominations of Protestantism, which is well and good, for as diverse as they are, they are still of one very specific and agreeable ethic regarding law and justice. One God. One way (basically). Even yet, for all their bickering internally, the Protestant Churches are still the most powerful political force in this country.
It is a far cry from the multicultural insanity you would endorse. It was never meant to accommodate atheists, Buddhists, Satanists, Muslims, Wiccans, Giaists, Maoists, etcetera ad-infinitum. It is precisely this line of thought that has brought us from the melting pot to the cesspool.
Do some research on the term "True Religion" in it's context at the time, and then read the founding documents, letters and various patriotic hymns which were in the top 10 at the time, and you will be better equipped to understand the meaning our fathers meant to impart.
"We have staked the whole of all our political institutions upon the capacity of mankind for self-government, upon the capacity of each and all of us to govern ourselves, to control ourselves, to sustain ourselves according to the Ten Commandments of God." -James Madison "The Father of Our Constitution" Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other. -John Adams
U.S. SUPREME COURT BUILDING
http://www.nps.gov/history/history/online_books/butowsky2/constitution9.htm
“Equal Justice Under Law”
To the right of visitors is a procession of historical
lawgivers of the pre-Christian era: Menes, Hammurabi,
Moses, Solomon, Lycurgus, Solon, Draco, Confucius and
Augustus They are flanked by figures symbolizing Fame
and History.
To the left are historical lawyers of the Christian era:
Napoleon, John Marshall, William Blackstone, Hugo
Grotius, Saint Louis, King John, Charlemagne, Mohammed
and Justinian. Figures representing Liberty and Peace
and Philosophy appear at either end.
MY OPINION: These figures represent philosphy and
religion, but the founders were determined that
justice would be determined by law and it would be
blind to color, class and religion. Muhammed is
represented as a lawyer, not as a religious leader.