Introduction From an evolutionary standpoint, social networks have been critical in the biological and cultural development of human beings (Pinker, 2010; Hrdy, 2011; Price & Johnson, 2011). Cooperative hunting and food sharing, alloparenting of kin and nonkin, reliance on others during times of sickness or during periods of pregnancy and potential tribal warfare are all staples of the sort of foraging existence within which the human mind evolved (Tooby & Cosmides, 2015). The ultimate punishment meted out by foraging groups is social abandonment, which is certain to result in death (Boehm, 2012), and today in modern societies, socially isolated people experience greater subjective pain and higher rates of mortality (Eisenberger & Lieberman, 2004; Lieberman, 2013; Holt-Lunstad, Smith, Baker, Harris & Stephenson, 2015). Fundamentally, then, humans are a social species, relying on social capital, or the support emanating from social networks, to survive. Secondarily, from a cultural standpoint, the material security hypothesis suggests that in societies that are unstable or impoverished, people will tend to seek out dense, homogeneous social networks that help to meet needs for food, shelter and protection (Hruschka et al., 2014). Regarding religiosity, this indicates that material insecurity will tend to motivate people to embed themselves into dense, homogeneous religious communities in order to seek safety and material support (Norris & Inglehart, 2011; Barber, 2011). On the other hand, the expansion of impartial and well-funded social welfare institutions will reduce material insecurity and, thus, commitment