I am married. I love my wife. Gay marriage in no way whatsoever harms or changes that. There is nothing approaching reason that blocks gay marriage.
That hard headed people want to force their own beliefs upon everybody else to the detriment of the latter's personal liberties ceased being a surprise to me the day my second grade public school teacher held me back during recess so her strange friend (a trespasser on school grounds) could come in and exorcise the demon that caused me to daydream a lot (she called it "not being obedient to her will") by forcing me to "accept Jesus into {my] heart." Evidently, I did not seem sincere enough (I wasn't; I was totally terrified) because I was not allowed outside all day, even for PE.
A scant year later, I learned this lesson again, when, after moving to another town, a troop of door-to-door Jesus ladies stopped me in the street and grilled my nine-year-old ass on what religion I might be and whether I had the right Bible in the house and whether they could come in and examine it and instruct me, until one enterprising young fellow (with whom I am friends to this day) ran inside to get his mom to come out and chase these EVIL PEOPLE away.
And though I myself am a child of wonder, who imagines all sorts of things that might be possible in this grand Universe, I, to this day realize that a great many religious people in this world, maybe most in the case of a certain two largest religions, are actually pretty evil, and are either too ignorant, or too willfully ignorant to accept that. Their religion brings them to hate, and that is what holds back gay marriage: hate.
There is nothing anyone will ever say or do to make me forget and pretend that the only "reason" for keeping these people down is hate. It is obvious, it is right in front of us all of the time. Denying it is like letting loose a 200-pound, axe-wielding gorilla on a kitten, and then claiming you are just trying to "protect the apes." Generally, conventionally religious people are hateful, frightened, and the cause of most needless suffering, and the denial of basic human rights for anyone with whom they do not immediately identify, and at 2:21 in the morning, I think nobody need censor themselves about this obvious fact.