Here are the cons
-God's Word is the Bible, and the Bible shows homosexuality as being sinful, as being against God's design for human sexuality. It is by no means some kind of special sin. It is one of many sins, and it is one of many sexual sins. Also, marriage was created as between a man and a woman. There is a complimentarianism in the design between the two genders. In short, I have a very hard time voting to endorse something that I know God hates.
-Marriage is not just about personal and private fulfillment and happiness. We tend to think that it is, which may possibly be one of the reasons the divorce rate is so high -for marriage was not intended to carry such a load. I believe marriage is the fundamental building block of family and community. I believe if we mess with that, it will impact human community and society to some degree, and that degree is unpredictable.
But here are the pros
-In the United States, we Christians enjoy many liberties. Armchair-activists whine about things like how we are not allowed to pray in school (which is untrue... it is, as I understand it, merely that public schools cannot mandate prayer), and others chide on about Obama and the political left and how they are wrecking this country, but how often do we really sit back and thank God and our country for the fact that we can pray, think, speak about, and worship God basically however we want? How often do we really think about how great it is that we have the liberty to publicly blame Obama or whine about how public schools do not mandate prayer? We basically have the right to do and think and say and believe whatever we want so long as it does not violate the rights of someone else. These are things not found everywhere in this world, not by a long shot. But here's the problem. We have these liberties in the good ol' USA only because these liberties are open to EVERYONE. Islam, among the litany of other cults and religions represented in this country, is morally and theologically wrong and abhorrent to God, but we permit muslims to practice Islam here. Why? Because although it is wrong we understand that the freedom for Muslims to practice Islam is the same freedom that allows us to practice Christianity. If we seek to shoot down this freedom for Muslims because Islam is wrong then we are shooting this freedom down for everyone, including ourselves. To me, that is scary. This same principle applies to the gay marriage issue, I believe. Although I believe homosexual union is wrong and abhorrent to God, our personal and private liberties are important to safeguard because they do not only protect the homosexuals but they protect you and I. If we shoot them down, if we start feeding the government, giving it more control over the private spheres of life, it will come back to bite everyone, including us.
Why can we support things like religious liberty even though it endorses the freedom to practice ungoldy religions but we cannot support this freedom? Why the double-standard? And why do so many Christians make this such a pet issue? I'm really not sure.
-What message are we sending gays and the broader culture as Christians? Wouldn't it be something like this: "We are ok with how our country supports religious and civil liberties, but only when it supports our personal religious and civil liberties. The rest of you all can go to hell." It promotes the very negative stereotype about Christians which is that we really only care about ourselves and our tribe. This is destructive, it is anti-Gospel, and it should be untrue of us. We should be those who care about the common good, who love all of our neighbors, who strive for the betterment and support of everyone, not just ourselves.
I can't believe I'm actually saying this, but I think I am becoming a supporter of gay marriage rights. It is not because I support homosexuality. I cannot support homosexuality any more than I can support adultery or fornication or greed or stealing. It is because I support the US government upholding our common liberties. I support government staying out of our private lives unless it is causing clear harm to and violating the rights of others (such as with abortion). The ideal world I long for is not here yet. In the meantime, it behooves me to support rights which endow freedoms to all of us, and it behooves me to seek ways to love those I disagree with. To love my neighbor, whether Mulsim, Catholic, Mormon, black, white, gay, straight, or whatever.