Are We Unable to Share the Truth That Abortion Is Wrong?

In a personal conversation with someone talking about same-sex marriage, you have freedom and latitude to talk about who gave us marriage. But when you're in a media setting, it's different. Are we unable to share the truth that abortion is wrong unless we bring the Bible into it? I'm sure White would agree that we can show abortion is wrong apart from what the Bible teaches. If you want a good book on defending marriage in a post over Gefel world where so-called same sex marriage is essentially the law of the land, I'd recommend Ryan Anderson's Truth Overruled.