What does the Bible says about gay marriage? The Bible says absolutely nothing about gay marriage, just as it says nothing about first trimester abortions, or stem cell research. The Bible does talk about men having sex with men and women having sex with women. Here is what it says:
Paul to the Corinthians, "Do you not know that the wicked will not inherit the kingdom of God? Do not be deceived: Neither the sexually immoral nor idolaters nor adulterers nor male prostitutes nor homosexual offenders nor thieves nor the greedy nor drunkards nor slanderers nor swindlers will inherit the kingdom of God." 1 Cor. 6:9-10.
The Torah: "Do not lie with a man as one lies with a woman; that is detestable." Lev. 18:22.
The Torah: "If a man lies with a man as one lies with a woman, both of them have done what is detestable. They must be put to death; their blood will be on their own heads." Lev. 20:13.
The Torah: "There shall be no whore of the daughters of Israel, nor a sodomite of the sons of Israel." Deut. 23:17. (I had to use the KJV here because sodomites is translated as prostitute in the NIV.)
Then there is this strange little story in Genesis wherein Lot offers his daughters to a mob of men who have come to rape the two male angels that are visiting Lot, just before God destroys Sodom. Then Lot leaves the town, his daughters get him drunk, and they all have sex in order to keep the race of alive. They become the Ammonites.
So, I don't know what you get out of the story of Lot. The rule seems to be that it is wrong for a mob to rape angels, even more wrong than allowing a mob to rape your daughters. Seems to not really inform the gay marriage discussion.
Then we have the three excerpts from the Torah. First, the Torah say you have to kill them. Does anybody think you should kill gay people? 'Cuz that's what the Bible says. The other thing is that we don't still hold slaves, which is okay by the Torah. We don't keep Kosher. We don't execute people who talk back to their parents.
Now, we're left with Paul. Paul lists homosexuality with many other immoral activities. Paul definitely is suseptible to the same treatment as the Torah. Paul says woman shouldn't speak in church. He says that you shouldn't get married because the second coming is right around the corner.
The Biblical case for accepting slavery and pluralistic marriages is much stronger than the case against homosexuality. In short, I think it is clear that Christians need to explore their own hearts to find what they believe on this issue.