Let's imagine there is a man on an island, somewhere far across the globe, and a missionary has yet to reach him.  The man has never heard the name of Jesus.  Is he a sinner?  If so, how is he to be reconciled with God?  

Justin Martyr was a second-century theologian and defender of the faith who wrote two Apologies and Dialogue with Trypho, but most importantly, he knew how to start a conversation about Jesus.