Bringing in the statistics on cohabitation into a discussion of what gets awarded at divorce introduces irrelevancies. See my post just above.
If you fail to see the connection between the two then there is little to discuss. When an increasing number of post-Christian Americans are cohabitating instead of marrying, then certainly the divorce outcomes have to be examined as one of several reasons. As far as your post above, churches should completely separate their concept of marriage from that of Caesar; Caesar’s contracts & conditions are what keeps many away from it.