My old economics teacher at school, George Stanlake, used to tell us that economics was the science of how resources are allocated in a society. That's true. But what you will notice about that definition is that it is very political (I suspect that was George's point, though I never saw it at the time!).
Economics has never been a pure science. It has always been as much a political tool as it is a method for understanding resource allocation.
Is this the reason why Christians have always disagreed on how the economy works, since economics is a footnote to the political stance that shapes the way we each see the world?