Yeah, I don't know if I buy this. What strikes me is, why would someone go through a radical change in their religious views
as well as their political views in only a short six months because they go to church more often? Unless it's a cult or something.
But on the question of missionary dating, my opinion as I understand it is, of course, highly negative. If your relationship is completely based on one partner trying to change the other person's religious views, I don't see how it would add anything but strife to that relationship. (Though speaking as someone who's never been in a relationship before, I suppose I'm no authority on this...)