My post this afternoon on same-sex “marriage” (SSM) might help you deal with two common objections to man-woman marriage.
The first goes something like this: “Why can't gays be married? Why do men and women get all the rights and they get none?” That question comes from a wrong starting point. It starts with the assumption that marriage is about the couple. You can gently point out that marriage was always intended to be bigger than that. It was intended to be love overflowing into the next generation.
Don't be surprised if the objector comes back with more questions. What I just stated is only the starting point toward an answer; it's nowhere near the whole thing. You can search the “Life and Choices” or “Same-Sex 'Marriage'” links listed at the bottom of this post for more information.
From today's post, though, it should be clear that if someone says to you, “men and women haven't exactly set a great example in their marriages,” you can agree. It's okay to agree even if you're not happy with your own marriage situation: God is gentle and gracious with people who admit weakness and/or mistakes. Other people are often gracious too.
And if I'm right with my closing paragraphs in that post, you might even be able to find a point of connection with the person there. Maybe they're angry at marriage. Maybe they've been really hurt, either by their parents or by their own past relationships. A listening ear could go a long way.