Even in a society of unbelievers (say, in Communist China or Vietnam, or the Czech Republic or Estonia) people can marry intending an exclusive, faithful, mutually benevolent, fruitful, lifelong union, and if they do, they and their next generation, and society in general, will reap many of the rewards of a strong "mariage culture" even without the blessed or Sacrmental forms of marriage.
I'm no saying religious faith is irrelevant. Not at all. There is a positive correlation between religious faith and a marriage culture. But my point is that even the irreligious can marry; and if they do, it holds rewards for them, their chiuldren, and their society.
Well said.