>> Well, that was not the issue under dispute, as I understand <<
Then maybe you should refrain from the snarky, sarcastic comments, because I was responding directly to the question, “[W]hat role did Catholics play in forming the institutions of this country?” I was not answering, “what were the demographics of the founding fathers?” Common law is an institution of this country which considerably predates the Constitution, and from which the Constitution depends.
You have a different understanding of the question than I do. Using your understanding, we could as well be talking about the role that the pagan Romans had on the founding of America. And come up with plenty of stuff. But actual Catholics were few enough on the ground at the founding of the United States. Not absent of course, there were plenty, but their influence was definitely not the major portion.
Don't make it personal; I'm not.