[Joseph Harrolds]

This suggests a long term trend, even from a Darwinian perspective, in which secularism is bred out of the gene pool.

I don't think being secular is a genetic trait. If I had been brought up in a religious household, there's a good chance I would be religious to this day.  As another poster suggested, there seems to be a trend for societies which are very well-off to become more and more secular.

I think it's more instructive to look at secularism from a sociological viewpoint than a biological one!

[rightwingcrazy]

Meme vs gene, but I’m not talking about genetic inheritance here. Children tend to take on the values and beliefs of the parents that raise them, and religious people bear and raise a lot more children. And as I said, this demographic counter-trend is starting to play out.