One thing that a lot of people don't seem to get is that religious objections should have no weight under the law. Unless they have secular objections, then there is no reason not to allow it. And I know of no good secular reasons against gay marriage (aside from arguments against marriage in general.)
Not only that, but it seems to me that "one man, one woman" laws are highly discriminatory. And not just against homosexuals, but against men and women in general. By adding that in, they are supporting the idea that men have a particular role they are suppose to fill in society, and women have a particular role they are suppose to fill in society. This is not something that should be dictated by law. I find the very idea to be a great injustice. I don't think the law should make any distinction between men and women except where strictly necessary, and I suspect such cases are rare.
