The founding fathers were by far Protestant Christians. The largest number were raised in the three largest Christian traditions of colonial America:
1. Anglicanism (as in the cases of John Jay, George Washington, and Edward Rutledge).
2. Presbyterianism (as in the cases of Richard Stockton and the Rev. John Witherspoon).
3. Congregationalism (as in the cases of John Adams and Samuel Adams).
Other Protestant groups included the Society of Friends (Quakers), the Lutherans, and the Dutch Reformed. Minority positions included three Roman Catholics (Charles Carroll, Daniel Carroll of Maryland, and Thomas Fitzsimmons of Pennsylvania) and a few deists with Thomas Paine being the most prominent.
While it is true that the American enlightenment influenced their thinking, so did their Christian view of the world. It is a false assertion to wrongly state that it did not.
According to the founding fathers, the United States should be a country where peoples of all faiths could live in peace and mutual benefit. James Madison summed up this ideal in 1792 saying, "Conscience is the most sacred of all property."
Additionally there was a limited involvement with Freemasonry of the antique kind (not like today) that had a relatively small influence on America's foundations. If you're interested in this subject, I recommend 'The Question of Freemasonry and the Founding Fathers' by David Barton.
The war over whether Christian was intended to be a secular or Christian nation is not black or white; one or the other. As Bill Flax notes:
"All thought the Bible essential for just and harmonious society. The Founders disagreed on much, but were nearly unanimous concerning biblical morality. They understood the relationship between state and society differently than progressive thinkers today: government cannot mold man. Righteous men must mold government which requires the inculcation of virtue through vibrant churches and the transmittal of values generationally via a social structure based on families.
Usurping the First Amendment to obstruct public expressions of faith would leave the Founders aghast. Not only did the Constitution leave extant the official religions authorized in most of the states, but as historian Thomas Woods explains:
'Prohibiting prayer in public schools runs exactly contrary to the Framers intent... a stupefying departure from traditional American principles and an intolerable encroachment on communities rights to self-government.'
Jefferson ’s 'wall of separation' guarded faith, or lack thereof, against political interference. Far from uprooting our cultural moorings, the Forefathers embraced our heritage.
Historian Larry Schweikart notes, 'The founding documents of every one of the original thirteen colonies reveal them to be awash in the concepts of Christianity and God.'
Youth learned to read using Scripture. Universities were chartered to teach doctrine. Students could not even enter Harvard, Yale or Princeton without assenting to the Westminster Confession.
John Adams noted, 'The general principles on which the fathers achieved independence were the general principles of Christianity.'
Per Paul Johnson, 'The Declaration of Independence was, to those who signed it, a religious as well as a secular act, and the Revolutionary War has the approbation of divine providence.'
The Declaration contains four clear references to God. Independence was predicated on the 'laws of nature and nature’s God' because men are 'endowed by their Creator with certain unalienable rights.'
The Continental Congress thought success dependent on 'the Supreme Judge of the world for the rectitude of our intentions' to whom they relied on for 'the protection of divine Providence.'
Secularists claim designations like 'laws of nature' evidences Deism, not Christianity. But that phrase also appears in the quintessential statement of Protestant faith, the Westminster Confession, where 'light of nature,' meaning the same, appears repeatedly. Many Founders would agree that it does both not one or the other.
John Locke, whose influence was indisputable, clarified that natural rights need to 'be conformable to the Law of Nature, i.e., to the will of God.' And that legislation must be 'without contradiction to any positive law of Scripture, otherwise they are ill made.'
Blackstone’s Commentaries, a pivotal support for America’s common law system, rests upon both sources for truth in Christian thinking. There is 'special revelation' in the Holy Scriptures and 'general revelation' of a complex, yet sublime world working according to an ordered design subject to discoverable natural laws."
So while the United States was not founded as a Christian nation, it was largely comprised of Christians who never meant for the U.S. to be theocratic or homogenous religiously but did intend for the Christian worldview to be indelible to our social fabric and the founders, even the few non-Believers before the rise of rabid New Atheism, considered that a blessing.
Your false assertion is patently and demonstrably false amdg.
I'm sorry but this country was founded on the ideals of the Enlightenment and not "Christian liberty."