About six years ago, Life magazine ran an article on the historicity of Jesus and I was floored to find that they conceded the only evidence we have for his existence is in the Gospels. But don't take Life's word for it. In his book The Quest of the Historical Jesus, the most definitive study that's ever been done on the subject, Albert Schweitzer admitted that there isn't a shred of conclusive proof that Christ ever lived, let alone was the son of God. He concludes that one must therefore accept both on faith.
