... And indeed, I just verified the footnotes and sources on pages 72-74 of The Search For Christian America. They are all accurate as is their assertion “The God of the founding fathers was a benevolent deity, not far removed from the God of eighteenth-century Deists or nineteenth century Unitarians.”
One caveat, if “Deism” is understood as the cold, distance watchmaker, it would be misleading. However the God of the 18th Century American and English “Deists” was chiefly “Christian-Deism.” Indeed, it’s hard to imagine describing a cold, non-intervening watchmaker as “benevolent” as the authors do (and the Founding Fathers did). Further, the God of the nineteenth century Unitarians (at least for most of that century) was understood as a “Christian” deity with a consequent denial of the Trinity and affirmation of unorthodox understandings of biblical texts and doctrines.