OK, perhaps "Humanists" is the wrong word as a lot of them were deists.
But when I hear a UU saying rude things about Christianity, I frequently think to myself "asshat humanist." Though I am a humanist, I try really hard not to be an asshat humanist.
For example, I would never describe a Catholic mass in mocking terms, finishing my essay off with the words "Here is everything which can lay hold of the eye, ear and imagination--everything which can charm and bewitch the simple and ignorant. I wonder how Luther ever broke the spell," the way John Adams did in his diary in the early 1770's.
In fact in reading Brooke Allen's Moral Minority: Our Skeptical Founding Fathers I am frequently amazed at how the Founding Fathers saw religion in many of the same ways I do on a bad day, they were just way more blunt about it.
I am delighted by this exhaustively-researched book that presents example after example of Founding Father snark revealed through primary sources.
Not every Founding Father was like this. George Washington faithfully attended church when he was in office and expected to, then promptly quit as soon as he was less prominent in the public eye, going to church only three times in the last three years of his life. (One could call this the "ChaliceDad method.") He never seems to have mentioned religion when he didn't have to and historians note that he would frequently edit references to Jesus out of his speeches and proclamations when they were put there by more zealous speechwriters.
Now the Founding Fathers were as diplomatic as anyone else in public. Most of the snark comes from diary entries and their letters to each other.
I've heard people posit that arguments about abortion, gay rights, etc, are the concerns of the lower and middle classes. The folks truly in power don't really care about them, but keep them just stirred up enough to keep poorer people fighting each other instead of working for a more egalitarian society.
Though I don't think the founding fathers fit this mold, I got a whiff of it as they wrote about their own indifference to the sorts of matters of doctrine that still cause dramatic church divisions today. Some were more sympathetic than others, but religious difference as what the lower classes do to amuse themselves was something of a pervasive theme.
And I'm only halfway through the book. I'll let you know if I continue noticing this pattern.
And yes, as Joel Monka reminds me, I owe you guys a SpiderMan review.