Marriage goes way beyond the Jewish and Christian spheres. It's a far-reaching anthropological value. Strictly speaking it's a natural state, which means it isn't an invention. What we're missing most of all in contemporary times is an appreciation and acceptance of our contingency as beings. For want of this restful appreciation of what we really are, we have a tendency to become angst-ridden, semi-nihilistic types trying to find our bearings through acts of will and experiencing misery because we can never get there from here by traveling that path.

> This view stems from Judeo-Christian beliefs.

It's really not, as marriage is present in pre-Christian belief and in non-Christian traditions.

Does it look exactly like Christian marriage / family? No

But it does share common characteristics. There is a single man, and one or more women who bear his children. The man and woman have particular authorities over their children, and as the children grow there is a system to determine how they inherit their parent's resources, and then perhaps some duties they owe their parents.

We see this in the Roman paterfamilias system, the Confucian filial piety system, the various Indic philosophies, the ancient Egyptian family system, the Babylonian familial system, etc. Together these encompass the basis of the vast majority of civilization.

You're right that in hunter gatherer tribes they may have not even understood how reproduction works, but given that these social systems are not sophisticated enough to run our society, I'm happy to just ignore them. There were hunter gatherer tribes that believed that prince phillip was a god; they're not that sophisticated

Which communitarian society is less sexist? Best afaik, all the community minded societies are significantly more sexist. The individualism is one of the things that makes it easier to push and argue against it.

Why do you think a recognization of the very human tendency to do stuff which harms either you or the society a remark for the unintuitive Christian concept of original sin?

I think this would imply that non-Western societies (or even Western ones before the spread of Christianity) aren't organized out of families? Also, what is a "shotgun wedding" in this worldview?

Not at all. Family units are extremely widespread in cultures around the world, including those that have had little or no contact with Judeo-Christian beliefs. Nearly all cultures have them.