How do we as Christians reach a culture that is much less sensitive to Christian morality and doesn't share Christian morality anymore?

Number one, we need to live Christian morality. We need to hold ourselves to higher standards of living. We need to focus on sanctification, not legalism, sanctification. Yes, we're saved by grace. We also live by grace. That grace should be transformative, so we should look different than the world.

We have to know what the Scriptures teach about morality and live it consistently. That will hopefully paint a picture for people of what this looks like, and they’ll actually see it in our lives. That is probably the most compelling way to reach a culture that is post-Christian in its moral views.

When they see us living this way, they’ll see the flourishing that results. When we live the way that God designed us to live and intended us to function, that's going to result in human flourishing. When people from the outside looking in to our lives and our Christian communities and see us flourishing, that's going to be a compelling vision. It's going to provoke their questions.

When they ask those questions, the second thing we need to be able to do is to articulate Christian morality intelligently. We have to go beyond “because the Bible says so.” We have to do more when it comes to our moral reasoning.

Eventually, we can make the case for Scripture and the case for morality that’s laid out in Scripture. But oftentimes, with people who don't share our convictions about Scripture and about God's Word, you can't start there. You can start with the natural order. You can start with the reality that we both know. So we need to articulate Christian morality without making simplistic appeals to “the Bible tells me so.”

We can point to obvious moral truths that every one knows even if they want to deny them. They know it's wrong to torture children for fun, for example. We start with some common ground, and build our case from obvious moral truth to the fact that there are objective moral truths.

Then, the question is going to be, “Where do those [objective moral truths] come from?” We need to intelligently articulate this and help people realize that if they're going to affirm objective moral values, the way to best explain these is through God and His existence. Not just any god, but Christian theism.

We need to be able to articulately make a defense for Christian morality and give good reasons why we believe these things. Live it and articulate it intelligently, and I think that's the way forward in a post-Christian culture.