Why do some Christians support gay marriage, and seemingly have no Biblical reason for it?

I do not support gay marriage, but before any liberal Christians start yelling at me, comparing me to the WBC, telling me I am an embarrassment to Christianity (yes, thanks for that, that isn't amongst the most harsh and hateful type of thing you can say to a fellow Christian at all), consider this:

-No, I do not hate gay people. I do not demean gay people. I do not think gay people are condemned to Hell (1 Corinthians 6:9-10 refers to practicing homosexuals, not people with the orientation). No I do not think that gays are inferior, cursed or "scum". No I do not think that God hates them. Yes, I do think that people who condemn homosexuals should stop what they are doing, and they are not representing Christianity very well, but that is not for me to say. I only pray for them, that they will look past their hate. As far as I'm concerned, there's a difference between being gay, and acting on it. It is the act that is the sin.

- I go by what The Bible teaches. Where's your Biblical evidence that suggests homosexual marriage is okay? Please provide some, because most of you don't seem to at all. You accuse me of twisting scripture- take a good look at what you're doing first. As far as I'm concerned, The Bible does not permit gay marriage:

Romans 1:26-27: "Women stopped having natural sex and started having sex with other women. In the same way, men stopped having natural sex and began wanting each other. Men did shameful things with other men, and in their bodies received the punishment for those sins."

Genesis 2:24 "That is why a man leaves his father and mother and is united to his wife, and they become one flesh"

And if you think the context is not marriage, then I would advise you to read Mark 10: 1-9- Jesus explicitly quotes Genesis 2:24 in the context of marriage, making it obvious that this is the true marriage GOD intended. It is also mentioned again in Ephesians 5:31-33. Paul mentions marriage in Romans 7 and 1 Corinthians 7, and in fact, nowhere in The Bible is marriage ever mentioned as being described as a man and man, or woman and woman, but always a wife and husband/man and woman. It can't get much clearer than this. Now, forgive me if I'm being very ignorant and shallow, but that appears to me like the definition of true marriage.

- "You shouldn't be judging other people". Where's your argument, beyond "don't judge others"? I'm sorry to break it to you, but actually, there's a difference between judging and rebuking/correcting:

Galatians 6:1- "Brothers and sisters, if someone is caught in a sin, you who live by the Spirit should restore that person gently. But watch yourselves, or you also may be tempted"

Matthew 18:15-17- "'If your brother or sister sins, go and point out their fault, just between the two of you. If they listen to you, you have won them over. But if they will not listen, take one or two others along, so that "every matter may be established by the testimony of two or three witnesses". If they still refuse to listen, tell it to the Church; and if they refuse to listen even to the Church, treat them as you would a Pagan or a tax collector"

So, please don't hide behind this accusation that I'm "judging" you. It's actually hypocritical, since you seem to define judging as simply pointing out something wrong, when in fact, you would be doing that to me.

- Accusing me of self-righteousness is pointless. I'm only expressing my honest opinion, in accordance with what I believe to be the truth, because of what The Bible teaches, not what society teaches and not trying to appeal to anyone's emotions, nor do I care about imaginary so-called illusory "social status" or the lie of "popularity" which dominates the world. I'm no more "self-righteous" than you are.

- No, before any of you accuse me of being "homophobic", "brainwashed" or "fundamentalist religious nutcase" who goes around condemning homosexuals and bisexuals to Hell. I don't have that authority- only God does. Doesn't meant I have to allow evil such as gay marriage to exist, however. I care about the truth, about what The Bible says is right. What's so wrong about that?

Sorry, I am frustrated from all these liberals and liberal Christians who try to condemn me for not agreeing with them, and categorizing me as the type of person who "makes Christianity look bad". It's all an emotional sucking-up-to-popular-opinion fallacy, in my brutally honest opinion. Sometimes, fellow Christians anger me more than atheists do. And that's no joke.

Liberal Christians/Christians who support gay marriage- Give me Biblical evidence that homosexual marriage is acceptable. And please cut out the "you're an embarrassment to Christianity/the world hates you/stupid right-wing fundamentalist judgemental religious legalistic nutcase/people like you are the reason Christians are hated/homophobic/bigoted/intolerant/hateful/you hate gay people for not agreeing with their marriage" bullcr*p if that's possible. I've always been a let-down to the world anyway, so I'm not going to care about that (having been an unpopular social outcast my whole life, it makes no difference anyway, so I have no reason to care about "popularity").