Philly Style, thanks for the contribution.
Not surprising, I tend to disagree with your last paragraph. From my perspective, child-rearing the most basic of the socio-economic relationship. Science has demonstrated the criticality of socialization for child development. And I doubt most anyone would question the critical nature of economic support for those unable to support themselves. I would conclude that such relationships are the most basic. Certainly, (traditional) marriage is but one means to that end.
It is certainly arguable that the Roman Catholic church has had more influence on the concept of monogamous marriage worldwide than any other single factor. Likewise, the same could be said for any sexual activity outside the purpose of procreation, including sodomy (including oral sex), adultery, fornication, and homosexuality. Would you agree?
Further, polygamy was actively practised by Catholic priests up until somewhere around 1020AD, and marriage completely voided for priests around a century later. Polygyny (if not in marriage, in concubines) was common among all other major religions, and even Christians, up until that time.
Were these actions taken from divine guidance? No, it was from concerns of the inheritance of church property to the sons of priests.
The idea of monogamous marriage traces its roots directly to the Roman empire, not the bible, or any direct religious inspiration per se.
Unless you disagree with that analysis (and I would be interested if you do), how would you conclude that, “even with out God, society would have a compelling desire to create this insitution and the stability it brings”?
Of course, I am assuming your reference to “this institution” references the modern concept of monogamous marriage. Please clarify if that was not your intent.