Religious Darwinism

Its been a while since i've read something on religion that made me think as much as this:

...religiosity emerged as a "useful" genetic trait because it had the effect of making social groups more unified. The communal nature of religion certainly would have given groups of hunter-gatherers a stronger sense of togetherness. This produced a leaner, meaner survival machine, a group that was more likely to be able to defend a waterhole, or kill more antelope, or capture their opponents' daughters. The better the religion was at producing an organised and disciplined group, the more effective they would have been at staying alive, and hence at passing their genes on to the next generation.

via Guardian.

Our religion is in our genes? Whoa. Gotta take some time to digest this.