For those of us who have grown up in the church, I think there is a subtle tendency to imagine that we are experts in Christianity. To put it bluntly, we think we know it all. Therefore, when we hear an argument against Christianity for which we have no answer, we assume that no answer exists. Of course, this assumption is naive.
The following is a collection of lectures that I have found helpful in addressing a range of issues related to the truth of Christianity. These scholars represent a variety of disciplines (physics, mathematics, biology, history, and philosophy), and the ideas they present are worth your time, whether you are an unbeliever skeptical about Christianity or a believer seeking to better understand and articulate the faith.
N. T. Wright on the Resurrection
John Lennox vs. Richard Dawkins
Peter Williams on the Gospels as Eyewitness Accounts
Alvin Plantinga Against Naturalism
John Polkinghorne on Science and Faith
Michael Behe on Fine Tuning in Biological Evolution
Daniel Wallace on the Transmission of the New Testament
William Lane Craig on the Existence of God