Worse off societies 'have God on their side'
High murder rates, abortion, sexual promiscuity and suicide, can cause religious belief, according to research published today.
That would require a corresponding increase on religious belief along with economic trouble, which I believe generally is not all that common. I don't know if I've seen any studies on that, though.
He wasn't actually asserting what he said; his comment, which I think is a valid one, is that the fact that these two go together may well imply that bad living conditions foster religious belief, instead of the other way around, and that we really cannot know what caused what just with this data alone.