Thanks for the serious, thought-out entry.
My limited government political philosophy and my Christianity are in harmony.
One need not even believe in God to see that there state has an interest in bride+groom pairings that it does not have with other kinds of voluntary social associations.
State licenses are issued on behalf of the people of a state, so the people should have some say in their terms.
However, I do believe that couples should be encourage to come up with a pre-nup, rather than allowing the laws/courts to impose a default pre-nup.
http://walrus.blogtownhall.com/2009/05/26/handy_dandy_marri age_neutering_plea_repellant.thtml