It's hard for me to understand objections to legalizing same-sex marriage.
For those who object because of the Bible, I think we pick and choose what to believe is right and wrong all of the time. The Bible instructs slaves to obey their masters. Jesus condemns all divorce (with no mention of remedies for those physically or sexually abused by their spouses). Women are told to be silent in the church. In several places the Bible contradicts what is now commonly perceived as just. God is. God is timeless. God is love. God is every good thing that happens in the world. God is inside of all of us. I don't think God is a celestial bureaucrat beholden to archaic understandings of righteousness, loving order above all else (including human beings, as chaotic and volatile as we can be). The Bible is supposed to be a tool to help us understand and connect to God, a help as we try to make sense of the world, not a source of perpetual condemnation.