>>This will not stop non-Bible people from breeding illegitimate babies who will more than likely be Liberal voters in 18 years.<<
Or maybe covenant marriage will come into vogue. Take the government out of it completely.
A Pastor says that he will officiate as a couple pledge a covenant to each other. Then everything that the cohabitators do, they do, only with vows to eachother and a piece of paper signed and kept at the church. All contracts are made with the two names, birth certificates, house deeds. At 25 they pay the government for the privilege of the legal piece of paper.
Tell me again why the government is involved with marriage?
Because inheritance and property ownership (or division) are legal matters, and they end up in the courts no matter what previous arrangements are made. If there is a stable law regarding marriage, which makes inheritance and property division "pro forma," rather than infinitely negotiable, then matters are both more predictable for everyone up front and less of a trial (literally) to the whole world at the end.
One might imagine a situation in which marriage was strictly a contractual agreement - any number of parties with any conditions they chose to agree upon. However, the first one would end up in court, with one or more parties claiming the contract was invalid because they were coerced ("He said he'd leave if I didn't sign!") or that the agreement was morally negated. Back to square one.