I need to put this book on my "to read" list.
"In a book in progress, I will argue that Milton is an early adopter of a set of positions characteristic of the Newton circle of the late seventeenth century. Shared Arian belief in a preexistent Son precluded full agreement with Socinians, who believed that the Son did not predate the birth of Jesus. Nevertheless, Milton and Newton shared Socinian and quasi-Socinian positions, for example, an emphasis on reason and an attack on metaphysics in biblical interpretation, an insistence on toleration, opposition to infant baptism, and a focus on the exemplary character of the Christ’s passion as opposed to stressing the crucifixion as atonement. Complicating reliance on categories and labels, the boundaries between Arians and Socinians in the seventeenth century were sufficiently fluid that one of Newton’s circle, Hopton Haynes, described Newton as Socinian, while another, William Whiston, labeled him as Arian. Frank Manuel, a leading scholar of Newton and religion, describes Newton as some Milton scholars have described Milton, as Arian in theology and Socinian in religion."
This was often the kind of "Christianity" that elite philosophical types in the American founding lauded. Or at least they lauded Milton and Newton (and Locke, Clarke and others).