Today, I was out, standing by street evangelists belting the first chapter of Bertrand Russell's Skeptical Essays at the top of my lungs. When I was near the end of the first chapter, one of them approached me. After finding out what I was reading, here's how the conversation went:
"Do you believe in Jesus?"
"Believe he existed?"
"So, what, was he just a great guy?"
"He probably believed that the world was going to end within his lifetime, but it's hard to know. We don't have first, even second-hand accounts. We do have Paul's letters, but those don't tell us very much."
"We have the Gospels."
"Those are annonymous."
"What about the Old Testament. Do you believe the Old Testament?"
"Oh, so that's out."
And that was about all he had.
It struck me that many Christians do not know any way to argue except from the Bible. They're supposed to go out an convert non-Christians, but have no real way to do it.