According to this study, divorce rates weren’t lower for religious people — unless they attended services:
Via The New York Times:
In a nationwide survey conducted in 2001 by the National Marriage Project, then at Rutgers and now at the University of Virginia, nearly half of 20-somethings agreed with the statement, “You would only marry someone if he or she agreed to live together with you first, so that you could find out whether you really get along.” About two-thirds said they believed that moving in together before marriage was a good way to avoid divorce.
But that belief is contradicted by experience. Couples who cohabit before marriage (and especially before an engagement or an otherwise clear commitment) tend to be less satisfied with their marriages — and more likely to divorce — than couples who do not.
And:
She was talking about what researchers call “sliding, not deciding.” Moving from dating to sleeping over to sleeping over a lot to cohabitation can be a gradual slope, one not marked by rings or ceremonies or sometimes even a conversation. Couples bypass talking about why they want to live together and what it will mean.
"Using German panel data from 1984 to 2007, we analyze the impact of labor division between husband and wife on the risk of divorce.
Gary Becker’s theory of marriage predicts that specialization in domestic and market work, respectively, reduces the risk of separation. Traditionally, the breadwinner role is assigned to the husband, however, female labor force participation and their wages have risen substantially.
Our results suggest that there are gender-specific differences, e.g. female breadwinner-couples have a substantially higher risk of divorce than male breadwinner-couples.
In contrast, the equal division does not significantly alter the probability of separation."
Source: "Effect of Labor Division between Wife and Husband on the Risk of Divorce: Evidence from German Data" from IZA Discussion Paper No. 4515, October 2009