Arguing gay marriage using God. There was a post on the World Magazine Blog, as well as an article a week or two ago that argued that Christians will lose the debate on gay marriage using only secular arguments, and that because the real reason that Christians are against gay marriage is that God ordained it that we need to include it.
I'm not sure about this. Christians should state that this is one of the reasons we are fighting for the definition of marriage as solely between a man and woman, but I think there are many good secular based reasons too. Besides the progressive left won't even care if we say it's "because God said so."
First Amendment Law professor Eugene Volokh made some good points about this last week too.