Well I finally got to meet John Fea in person as he notes here. (American Creation's Tom Van Dyke has engaged Dr. Fea quite a bit recently, so I was surprised that John didn't know of Tom's distinguished past.)
His lecture at the David Library was outstanding. He focused less on what the key Founders personally believed on religion (something his book does detail) and more on the contrast between the Godless (or God minimal) US Constitution and the then state constitutions which were quite explicitly Christian. Under the original federalist scheme, religion was left to the states. That changed with the 14th Amendment.
Even though I've followed Dr. Fea's work closely, something did slip by me that I learned last night: Christian Nationalists, trying to find "God" in the Constitution, invariably turn to the "In the Year of Our Lord" customary way of stating the date (why I concede the Constitution as God nominal, if not Godless). What I learned: That may have been, apparently, something the Framers didn't even write, but was tacked on by a clerk who recorded the document.
Anyway, this year I've seen Akhil Amar, David Post, and John Fea speak at the David Library and all three gave outstanding lectures. Though -- and I'm not not saying this -- judging by the Q & A and book sales, the crowd seemed to enjoy Dr. Fea's the most. All of his books sold last night. From what I remember (I could be wrong) that didn't happen with Post and Amar.
Finally, I also got to meet a blog reader -- Jim51 -- who learned about the David Library from me. He recognized me based on my online photos and introduced himself to me. That was very nice.