I feel like we've run this meme further than is useful; there's absolutely criticisms to be had about how the separation of church in state operates within American government but it's hardly the only "developed" (hate that word but you know what I mean) country to have a government that takes for granted Christianity as default; Britain, after all, has a state church – for (pun slightly intended) Christ's sake – that definitely bleeds into the way its government thinks about what a religion is and how much "religion" gets support.
I'm not saying I wouldn't prefer (and hope we move towards) a more strict and complete separation but let's not pretend America is astonishingly unique…
I'm sorry, what‽ As a black Chicagoan, no the Hell we aren't.