Imagine finding yourself in a Roman tavern in the year AD 100. You are locked in conversation with a friend who, like you, speaks in hushed tones. Although your companion is not a Christian yet, neither of you has a desire to be overheard. The topic of conversation is the reasonableness of the Gospel, but it will be another 200 years before it is safe to discuss such things openly.
When your friend asks you why he should consider converting, you run through the usual arguments. The Christian conception of God is more philosophically coherent than the gods of his ancestors. Plus there is the eyewitness testimony surrounding the Resurrection of Christ, not to mention the fact that Saul of Tarsus came to believe in this central miracle despite having every reason not to.
