the article itself states no causal inferences can be drawn

That seems untrue... or maybe just in my community/country
Older men seem to be extremely religious and very closed off to any other opinions on the matter. Older women seem to be set in their ways but it takes a lot to get an opinion out of them, when it comes out it's usually weird or based off their family beliefs and not their own.

So that means I have to choose between the boner and the cross? Do you know the cross was made out of wood?

Interesting correlation. I'd suspect it might have to do with a more vigorous lifestyle as opposed to a direct cause/effect. I'm pretty active physically and don't really have an interest in all the time consuming "churchy" stuff.

That's because the non believers aren't getting their balls kicked in everyday by having to tow the religious line