So what? Let's fire up that Way Back Machine for just a damn second. Thomas Jefferson was a deist. These Christian voters wouldn't recognize that "faith" as anything in the least similar to what they ingest as Christianity.
The GOP and enough others have ginned up a new religion out of whole cloth. They call it Secular Humanism. I don't know what the hell that is as far as doctrines and something to kneel to or pray to. I do know what secular means and I can even get to a definition:
a: of or relating to the worldly or temporal
A relationship to a god is completely missing in this definition and seems to abrogate the idea of a religion. Now maybe "humanism" is some sort of qualifier that makes it work. The American Humanist Association has this to say:
Humanism is a progressive philosophy of life that, without theism and other supernatural beliefs, affirms our ability and responsibility to lead ethical lives of personal fulfillment that aspire to the greater good of humanity
I don't get it. No god and no rituals and nothing having to do with worship and this is a religion? For pete's sake, Communism at least bothered to replace god with something, the State. Atheists have a belief or faith that there is "no god." I'd guess that what these "Secular Humanist" brayers are going on about is that somebody doesn't think their books and rituals are the be all and end all.
No, that really isn't what it's about. What it is about is that when their religion doesn't define legislation it must have been replaced by another. Somehow the idea that the Government's concerns really are "worldly or temporal" seems to have escaped them. Government is supposed to be somehow "right" with god which means that if the government concerns itself exclusively with "worldly and temporal" matters it must be using another religion in place of theirs. Humans being fallible and all, something must inform them.
That is the place where it all falls apart. I don't really have any idea how many religions there are or how many fractured pieces any one of them has; but it really ought to be pretty clear that there are a whole lot of opinions on that matter and that must mean that some pretty damned fallible humans are involved. That means that the fact that a government depending on fallible humans is an irretrievable proposition even if we go with their theocracy.
I really don't give a rat's patoot about your religion or lack of one, I do very much give a damn about being left alone in that regard. I don't want your religion. I also do not want my government doing the power seeking of getting "right" with god, nor do I want it messing about with you getting there.