BWIII just put up a thought provoking post on redefining marriage and looking at it from a Christian perspective. Very informative and thought provoking. Here is the link. Here are some excerpts:
“What should Christians think of this matter? Well, in the first place not only is marriage defined in the Bible as an act between a man and a woman, it is said that God initiated such an act in the first place. God brought the man and the woman together (read Gen. 1-2). The result of that marriage was a ‘one flesh union’, something which, if we understand it and exegete the phrase properly, is not possible for two men or two women to have with each other. Male and female were created in such a way that they, and they alone, can produce a one flesh union. This is not to say that other sorts of sexual activity could not create bonds of intimacy between two persons. This of course is the nature of intimate sharing in sex. The point is that these other sorts of unions are not what the Bible means by a ‘one flesh union’ (see e.g. Ephes. 5.21ff.).
The result of a proper marriage is not merely that the two become one, but that one of them, the male, becomes a husband and the other the female becomes a wife. It is no more possible for a female to become a husband than it is possible to have a female uncle or a male aunt (I’m am talking here about the issue of identity, not roles that one or another person might be able to play in some fashion).”