[quote=@Darcs]

Oh the Greeks! Have you ever read The Symposium by Plato? A popular theory that arose is described by Aristophanes-- essentially each of us is half of a whole being; some of us are men/women, some of us are women/women, and some of us are men/men. In the beginning Zeus cut each of us in half, which is why we spend our lives looking for our other half to make ourselves whole. It didn't matter whether or not the pairing was homosexual or not when it came to finding Éros.
[/quote]

The Greeks had many popular theories such as the one described; however, even if the Greeks are a 'classical' civilization they were hardly the first.  In any event this does not get in the way of the original point at all being that not every kind of love is Éros.

[quote=@Darcs]

Wow I've never met someone who had zero exposure to modern medicine before.
[/quote]
Humans are biologically programmed to be male and female, sure things can get messed up because of various factors but no one can argue that humans are sexual beings, as opposed to asexual or whatever.  But I digress, as someone who has grown up around doctors and the medical field your statement is completely faulty.  Yes some people are born with both sets or whatever but as far as medical science is concerned that is a mutation or the result of faulty DNA.  In any case everyone has choice to decide what to do with their own circumstances.

[quote=@Darcs]

Even if Civil Unions were equal in every way to Marriage, this would still need to happen. 'Civil Unions' were like telling people 'Oh, you can get married, but you can't call yourself married! That's our word. You are Civil Union-ed, you are not actually allowed to participate in this historical institution of love between two people!' The very concept of Civil Unions are a petty and childish political move.
[/quote]

Maybe, yet the concept would take care of many of the issues that cause problems.  Everyone is so worried about [i]equality[/i] that they forget the fundamental fact that there is [i]inequality[/i] in the world.  Everyone is different but instead people try to ignore that fact by saying we're all the same.  We are all children of God and are equally precious in His eyes but the plain fact of this world is that [i]equality[/i] is a myth.  No matter how hard they try it will never be the same even if it is called the same.

[quote=@Darcs]

Except marriage is a Pagan institution appropriated by the Church. 
[color=333333]Like most things about Christianity.[/color]
[/quote]

There was marriage long before Christianity was around so I find much at fault with your statement; however, you are right in that fact that many pagan influences have effected and entered Christianity.  The Catholic Church in particular was adept at incorporating the culture of an area to make the transition from the natives old lives toward their Christian ones easier to do.  Still there is no evidence that marriage has pagan roots, especially since the Jews practiced marriage from way before hand.  Also if you consider Adam and Eve as being marriage, even from the beginning of human existence.