Who cares if ALL births are out of government-sponsored wedlock? Fact is, the societies you mention have a much larger proportion of children living with both natural parents than the U.S. Obviously, the existence of government-issued marriage licenses isn't a key to stable families. If the government suddenly evaporated, would the type of marriages you believe to be ordained by God suddenly evaporate too, for lack of government endorsement?
I think you need to recheck your statistics. The fact is, in those Scandinavian countries, they have a much higher rate of out of wedlock births than the rest of Europe and more than 60% higher than the US.
Go re read you research, if in fact you did any. As I believe was said earlier, we have a maral issue we stand by here in this country. Also, any child who lacks a mother or who lacks a father, feels an empty void due to that missing parent of the other sex, male or female, mother or father, all their lives, and overcompensates in sometimes distructive ways to fill that void.
In fact, that is the main reason, when children are adopted they feel the biological need to find their birth parents, and when a divorce takes a parent away from that child, they are compelled to find that parent later in life. To have both parents is a biologically "normal" state of life. That is why you have so many saying marriage is about children. FACT