I was using "orthogonal" to suggest that economics and religion talk about very different subjects and to suggest that I see no contradiction between looking at the world as an economist and looking at the world as a Christian.
For example, economics suggests utility maximization as a goal. In economic terms, Christianity tells me how to define my utility function. Once I've done that, I don't see a contradiction between maximzing my utility and living according to my faith, for an essential feature of my faith is the belief that living life as a Christian is what I (and all mankind) was created to do. Can't maximize utility much more than that.
Of course, not everyone accepts the same faith - and even
amongst ourselves here at St. Maximos' Hut we've got a wide range of Christian denominations with some fairly deep theological differences. Economics can't tell us anything about how to resolve those differences or the even deeper ones between Christians generally and those of other faiths. An economist can tell us something useful about which religious faiths might succeed in gaining "market share" through practices that improve their success at winning converts. (You can read some excellent work on that topic, collected by the Center for the Economic Study of Religion,
here.) But that is a topic for another day/post.
So my claim of orthogonality merely was a claim that there was not a contradiction between being an economist and being a Christian.
I have taught economics at several private and public universities in the US. I would always get a particularly warm feeling on the first day of class when I would tell students that the basic assumption of microeconomic theory is that the material world cannot satisfy man's wants (the assumption of non-satiation). I was thrilled that this fundamentally religious (and somewhat ascetic) assumption was required teaching. -- S. Smith