Stanley Fish on religion, but from a philosophical viewpoint, not a theological one. Not precisely about the Founding, but outlines the issues that underlie most of our discussions here, especially where this leaves us in 2010.
[For the record, I'm more with Habermas in his "post-secularism," but Dr. Fish does a fine job of outlining the parameters. To my mind, Habermas ends up paraphrasing George Washington: "And let us with caution..." The more things change, the more they remain the same.]