From the later:
Apart from the hyperbole, what precisely is new about Stewart's reading of the founding? It's not his assertion that the religious views of the most prominent Founders were unorthodox. With apologies to David Barton, there is little evidence that the leading Founders were devout Christians who based their political philosophy primarily on Scripture. Whether we label them "deists" or "theistic rationalists" or "Enlightenment Christians," no historically sound argument can transform them into card-carrying evangelicals. Nor is Stewart being innovative in claiming that the Founders drew extensively from Enlightenment sources in thinking about the proper structure and function of government. Scholars of the Revolution almost unanimously agree with this, and that includes Christian historians who take religion's role with great seriousness.
But the predominant view within the academy would complicate each of these conclusions. Scholars typically argue that the leading Founders were unorthodox, but not irreligious. Yes, they found much of value in Enlightenment philosophy, but they gravitated toward the Enlightenment's more moderate expressions, especially Scottish "Common Sense" writings that could be reconciled with Christianity. ...Update: Here is a Q&A from the Boston Globe.