Helco's long essay on Christianity--actually mostly various types of Protestantism--and American democracy is a wonderful work of historical investigation and intellectual investigation. Based on a series of lectures he gave, centering on the work of Alexis de Tocqueville, Helco's broad thesis is that, soon after the first Great Awakening in American life (usually associated with the 1750s through the 1770s), the different Christian denominations of early America arrived at a point there they nearly all were in theological agreement regarding the relationship between religion and self-government: namely, that it was simply un-Christian to judge too harshly the particular beliefs of other Christians. This level of intra-Christian tolerance (which, again, was mostly Protestant, involving Quakers, Baptists, Presbyterians, Methodists, and more, but with Catholics being occasionally allowed in as well) came, over time, according to Helco, to contribute to notions of the human person, notions of human history, and notions of political life that became entwined with American democracy. He calls this long era of America's Christian civil religion the "Great Denouement," and thinks its legacy lasted until the rise of secularism in the 1960s. Since that powerful challenge, the fate of both democracy and Christianity in America--most particularly manifest by looking at changes in both American churches and American political parties--is, in Helco's opinion, in serious doubt.
I appreciated the criticisms of Helco's story presented by multiple scholars, particularly that which was provided by Michael Kazin, who pointed out the degree to which Helco's story privileges consensus over conflict. But really, the book stands or falls in value on the basis of Helco's tour de force, and I personally found it enormously insightful, pointing to many distinct phenomena in American life and showing how the evolutions of American Christianity linked them together. Helco takes us from the early Puritans to the political speeches of then-Senator Barack Obama (the book was published in 2006), and while much is left out, that which is included made good sense to me. I look forward to using the book in an upcoming class of mine this semester.