So here's the thing.
I think now is exactly the wrong time to decide that with the tides moving inexorably towards full equality there is no longer any need to try to change the minds of SOME opponents of gay marriage. It's exactly at this moment that people who are willing to try to understand the opponents of gay marriage and get them to change their minds can really make a big difference.
It's important to understand that not all anti-SSM folks are the same (just as not all racists are the same). The reasons, motivations, and most importantly attitudes of such people do actually vary, and I've always felt it's short-sighted to paint them all with the same "hate-filled homophobe" brush. I say this because I was one of those people when I first joined this forum a mere seven years ago, and it was partly because of people on this forum (special mention to Melon, who probably deserves lifetime credit as one of the most influential people in my life for helping me formulate this change in my understanding, and of course the ever faithful Irvine) that I came to a complete 180 on my views on homosexuality and SSM. Many of you were there to see it happen and could probably go back in the archives and find the conversations where the turnaround happened.
Further I would counter the JiveTurkey conventional wisdom that says the religious people are the most hopeless in terms of convincing them of the error of their ways. I would argue that a religious person in the proper frame of mind is a better bet to convince than a non-religious one. After all, if the only "reasons" to oppose gay marriage are religious than any one who still is against it without a religious reason is truly beyond reasoning as they have no reason to argue with. You will find many religious people, I promise you, that are finding that the traditional take on homosexuality from scripture is dissonant with the spirit of their faith which calls for love and acceptance. And for many of these people, a brusque command to junk their silly superstitions is not going to cut it. Indeed, there are many gay people who don't care to give up their religious faith thank you very much but based on what they hear from the JT's and INDY's of the world (strange bedfellows, indeed) feel that they are forced to choose between their identity as a gay person and their belief in God.
Look, I get that it feels good to sneer at the other side for their idiocy. I get the argument that some "arguments" deserve mockery and scorn. And if your only goal is to enjoy the good feeling of being right, then fine. But if you want to change some one's mind--and I for one thing, think that's kind of important--mockery, scorn, dismissal is not the way to go about it.