If good and bad, right and wrong, become concretly subjective then where do we draw the line? WHO draws the line? and will that line stay there?
I don't think that allowing homosexuals to marry will bring down the human race of course and I feel that people should be as free to disagree with it just as those that are free to agree with it.
I think that if laws are passed based on a democratic vote and the law passes that it means (ideally) that the majority of society agrees on that Law ( Of course we knwo that isn't always the case and some laws are passed without societies approval, taxes anyone!).
That said, a civil law like that should not be forced on forced on a memeber of a religion that has doctrines against it.