John Fea gave our blog an extensive and thoughtful review of STeven Waldman's Founding Faith: Providence, Politics, and the Birth of Religious Freedom in America here (or just scroll down).
Terry Gross's interview on Fresh Air with Waldman is linked here. An introductory blurb:
Fresh Air from WHYY, March 11, 2008 · Was America meant to be a Christian nation? Author Steven Waldman attempts to answer this and other questions related to America's religious history in his new book, Founding Faith: Providence, Politics, and the Birth of Religious Freedom in America.
Waldman is the co-founder of Beliefnet.com, a website devoted to spirituality and faith issues. In tandem with his book, Beliefnet has opened an online archive of historical documents related to the separation of church and state, and religious freedom in America.
There's also a short excerpt from the volume linked to the Fresh Air site.