This is like saying ships with blue flags are always bigger than ships with red ones. There may be some correlation, but there is certainly no direct causality. A proposition such as "People who believe in scientific principles produce more gross value than people who do not." might be more testable. "Logic is good for productivity" is probably a truism.

But taking it as far as national wealth versus belief in evolution is scampering and scraping the extremities, IMHO.

For example, the Saudis have HUGE national wealth as a result of sitting on oil reserves. This is true independent of their belief in evolution, Allah, or anything else.

A