I am another conservative. While I grant that according to most monotheistic religions, relgions believe that marraige is between a man and a woman, I also grant that the dark ages, as 2ndWhiteLine so aptly described DC, were primarily caused by the same set of relgious values that in essence ban gay marraige. It wasn't until the enlightenment that people realized that many of the facets of existence, that were labeled as "miracles of God," could be easily quantified by us mere mortals by use of logic and science.
At the time, logic and science were thought by the church (in this case the Catholic church was the main relgious force of the era and this is not meant as a bashing of the church in any way) to be evil and were banned with all mental and physical force possible. Eventually, after years and years of conflict, the church accepted that some parts of the Almighty's master plan can be figured out by those that He created. So, science, to a certain degree, was accepted.
To that end, should not other parts of religous context be viewed with more of an open mind?
I personally am a supporter of gay marraige. To deny homosexuals the right to marry the one they love means that I deny two of my best friends the right to be married. Part of loving all of creation is being compassionate.
If God made us in His "image," then by following the symbolic meaning behind it, He has given us the potential for omnipotence. Obviously, that is not exactly where we are going with this. According to the Bible, God allowed us to choose our own fate by eating the fruit (I blame women for the reason why we are not in Eden, but that is a different argument). So, we have the right to choose our own destiny, which means that every individual can make choices to discern their own future.
To that end, how can someone else have the right to choose how we live our lives? It should be solely up to the person to decide who they want to marry, man or woman.
I'm pretty sure that if the United States government ever permanently passes a pro-gay marraige bill, it will not truly be to support gay marraige, but to say to the rest of the world "We let our gays marry. What the Fuck have YOU done lately?"
(Quote partially borrowed from the movie "Wanted")