But it's you who sees religion where there isn't any. Why else would you call it "Calvinist"?
You should consider doing some reading, especially the writings of Max Weber -- "The Protestant Ethic and the Spirit of Capitalism".
In American history, the work ethic that places value on hard work and frugality is often ascribed to the puritans. It is by no means unique to them -- if I had brought up Asian Tiger Moms or the Jewish work ethic, someone else would have jumped on that, ignoring the rest of my argument.
But historically and culturally, the puritans were known to place a higher value on being good, hardworking people than on the ceremonies of religion. In fact, their whole idea is that being a good and useful member of society is a far better display of being "good" than going to church or confessions. In that sense, they have effectively distanced themselves from the traditional ceremonies of religion, despite the origins of the term (which is also why the new GOP has a bastardized concoction of values that admire both Jesus and capitalism).
In any event, I certainly think there is value to that worldview (hard work and frugality), your religious affiliations (or the lack thereof) notwithstanding. Perhaps I should call it the Horatio Alger work ethic, as Neal Stephensen calls it.
All right, all right. I'll stop having a beef with you.
Eh. You do realize that I am an American, right?