I am a Christian resident of New York City. I simply read things the other Manhattanites read (NY Times, New Yorker magazine, Wall Street Journal, and many of the books they read) plus all my Christian reading. I don't do anything special to understand skeptics. I also talk to a lot of skeptics and read things they point to.

We instinctively tend to limit for whom we exert ourselves. We do it for people like us, and for people whom we like. Jesus will have none of that. By depicting a Samaritan helping a Jew, Jesus could not have found a more forceful way to say that anyone at all in need - regardless of race, politics, class, and religion - is your neighbour. Not everyone is your brother or sister in faith, but everyone is your neighbour, and you must love your neighbour.

All human problems are ultimately symptoms, and our separation from God is the cause.

Some suffering is given in order to chastise and correct a person for wrongful patterns of life (as in the case of Jonah imperiled by the storm), some suffering is given not to correct past wrongs but to prevent future ones (as in the case of Joseph sold into slavery), and some suffering has no purpose other than to lead a person to love God more ardently for himself alone and so discover the ultimate peace and freedom.

It is because Jesus Christ experienced cosmic thirst on the cross that you and I can have our spiritual thirst satisfied. It is because he died that we can be born again. And he did it gladly. Seeing what he did and why he did it will turn our hearts away from the things that enslave us and toward him in worship. That is the gospel, and it is the same for skeptics, believers, insiders, outcasts, and everyone in between.

You are under-qualified for the job of God.

I've heard plenty of Christians try to answer the why question by going back to the what. "You have to believe because Jesus is the Son of God." But that's answering the why with more what. Increasingly we live in a time in which you can't avoid the why question. Just giving the what (for example, a vivid gospel presentation) worked in the days when the cultural institutions created an environment in which Christianity just felt true or at least honorable. But in a post-Christendom society, in the marketplace of ideas, you have to explain why this is true, or people will just dismiss it.