Final answer:
Luke presented the message of Christ through the sermons of Apostle Paul, who was instrumental in spreading Christianity in the ancient Mediterranean world after a profound conversion experience.
Step-by-step explanation:
Luke, one of the four evangelists, presented the message of Christ primarily through the sermons of the Apostle Paul. Paul, formerly known as Saul, became the foremost Christian evangelist after a profound conversion experience on the road to Damascus. His teachings, as detailed in the Epistles, spread Christianity throughout the Greek and Roman cities of the ancient Mediterranean world, contributing significantly to the formation of Christian doctrine.