Since marriage was God's idea in the first place, I think it's safe to say that God knows what works best.
And all one has to do is look at the sorry state of affairs in this messed up world if you want evidence that the world's ways don't work, and often lead to all sorts of problems.
But that said, to
Mashmont: how can you expect non-Christians to live according to a standard that they consider absurd, and be obedient to a God that many of them don't believe in?
Also, I'm sorry but you're not going to convince anyone with that approach....telling them they're all going to go to hell. Ha.