He didn't retell the nativity story because it didn't matter to the Greek speaking gentiles, instead he told them Jesus is the Logos (unfortunately translated a

He didn't retell the nativity story because it didn't matter to the Greek speaking gentiles, instead he told them Jesus is the Logos (unfortunately translated as Word in English), which was already a core concept in Greek philosophy, especially Platonism and Stoicism. The nativity was important for Jewish converts, partly because of descending from kind David (you'll notice the lengthy listings of ancestors in the synoptic gospels).