Why do you believe Christianity is true?

What's to distinguish from belief in a general God from belief in Jesus as God?  Surely it has to be more than personal experience, saying basically that it "works for me" or because I have "experienced it in my own life."  Surely that has to be more than that, but if you ask the average person (as this excerpt from a radio program attempts to show) this is likely what you will hear.  Now perhaps the people haven't fully thought out their answers, but their imemdiate response says something about the state of Christianity today and how the faith is being defended, or perhaps not defended.  This radio program makes the point that Christianity is true because it is grounded in the historical life, death and resurrection of Jesus and attested to by the reliable books of the New Testament that was written by eyewitnesses of these events.  If Jesus was not raised, then we are fools.  Why do you believe Christianity?