Well, at this point we really ought to look at India.
Population: over 1 billion
Religious split: Hindu 81.3%, Muslim 18%, Xian 2.3%, Sikh 1.9%
Economic growth after inflation: ~6% pa.
Are you honestly trying to say that this economic growth is all because of the Xian minority and gods blessing on them?
You mentioned that the difference in the figures between the US and Mexican poverty rates was because the latter were predominantly catholic.
How then do you explain the sucess of the French, who enjoy a very acceptable standard of living (and some LOVELY wines) and yet are 83-88% catholic, 5-10% muslim and only 2% Protestant.
we could move onto the Japanese, (84% Buddist and Shinto), Other 16%, Xian 0.7%, and even with their current problems, one of the richest nations on the world.
I put it to you that there is no correlation between economic strength or growth in a country and the size of it's fundamentalist christian population.