I am now at Gordon-Conwell Theological Seminary ready to study Greek for the next two months. I guy just called my new GCTS friend and asked about how to answer people who ask: "how we can trust the gospel accounts of Jesus when there are so many other "gospels" out there?" (e.g. the Gospel of Thomas). Here is an excellent, readable, and comprehensive short article by Dr. Craig Blomberg called "Jesus of Nazareth: How Historians Can Know Him and Why it Matters." It is something that you can give to those who ask, and better yet read it for yourself.