Final answer:
Luke's genealogy presents Jesus as a human linked to Adam, stressing his connection to humanity. This perspective was significant for Gentile readers and emphasized Jesus' mission to save all mankind.
Step-by-step explanation:
Luke's genealogy of Jesus traces his ancestors back to Adam because he wrote for Gentiles who had become Christian. He was stressing that Jesus is indeed human -- a descendant of the first humans. Also, he highlighted the truth that Jesus came to save all people, not just the Israelites.