The first great centers of learning--Harvard, Yale, William & Mary, Rutgers, Princeton, Brown, Johns Hopkins, Dartmouth, and what would become Columbia U. had in their official seals or emblems either Jewish symbols or Hebrew phrases. As a matter of fact, these universities offered courses in Hebrew, and knowledge of Hebrew was considered the mark of a learned gentleman.
The inscription on the Liberty Bell is a quote from Leviticus: "Proclaim liberty throughout the land unto all the inhabitants thereof."
Many of the first systems of law in early American cities were based on Old Testament laws--Jewish laws.
So no, I do not buy the concept that the United States was founded solely as a "Christian nation". But for the contributions of Jews, you would not have the America as it was in its magnificent prime, before corrupt politicians began their Death of a Thousand Cuts to our great nation, most notably the current Traitor-in-Chief.
There is a historic shul in RI the community goes back to the 1600 or 1700’s, was around I believe at the time of the American revolution war. Newport I believe.