Bud the author was not Luke, it was someone from a different culture and different time period writing from a different part of the world. It was a community effort by people far removed from Jesus and Mary's life.
The gospels all describe these events differently, because they all wrote what was important to each community. Its why there are so many contradictions in each tale about these exact events.
When you study these text at a higher level, you start to see who these people were paralleling, in the rhetorical prose. Without knowledge of how these authors were trained to write using Aristotle's teachings, all context and credible interpretation is lost.
In this time it was not only perfectly acceptable, but they were literally required to build divinity and authority in this character, in context to the fact they were competing against the Emperor followers who were calling him FIRST the "son of god"
Hi outhouse,
Those are synoptic gospels, they does not contradict with each other. They look like differing in perspective or views but connected and consistent upon studied. This is like an investigation through forensic, they are collected as narratives in different perspective but when combined, analyze or studied, they are perfectly matched.
Let us take an example with Mary, the message and appearance of angel. I will highlight those passages that has the same message.
Matt. 1:18-25
18. Now the birth of Jesus Christ was as follows: After His mother Mary was
betrothed to Joseph, before they came together, she was found with child of the Holy Spirit.
19. Then
Joseph her husband, being a just man, and not wanting to make her a public example, was minded to put her away secretly.
20. But while he thought about these things, behold, an angel of the Lord appeared to him in a dream, saying, "
Joseph, son of David, do not be afraid to take to you Mary your wife,
for that which is conceived in her is of the Holy Spirit.
21. "And
she will bring forth a Son, and you shall call His name Jesus, for He will save His people from their sins.''
22. Now all this was done that it might be fulfilled which was spoken by the Lord through the prophet, saying:
23. "Behold, a
virgin shall be with child, and
bear a
Son, and they shall call His name Immanuel,'' which is translated, "God with us.''
24. Then
Joseph, being aroused from sleep, did as the
angel of the Lord commanded him and took to him his wife,
25. and did not know her till she had brought forth her firstborn
Son. And he called His name Jesus.
Luke 1:26-35
26. Now in the sixth month the angel Gabriel was sent by God to a city of Galilee named Nazareth,
27. to a
virgin betrothed to a man whose name was
Joseph, of the
house of David. The
virgin's name was Mary.
28. And having come in, the angel said to her, "Rejoice, highly favored one, the Lord is with you; blessed are you among women!''
29. But when she saw him, she was troubled at his saying, and considered what manner of greeting this was.
30. Then the angel said to her, "Do not be afraid, Mary, for you have found favor with God.
31. "And behold, you will conceive in your womb and
bring forth a Son, and shall call His name Jesus.
32. "He will be great, and will be called the Son of the Highest; and the Lord God will give Him the throne of His
father David.
33. "And He will reign over the house of Jacob forever, and of His kingdom there will be no end.''
34. Then Mary said to the
angel, "How can this be, since I do not know a man?''
35. And the
angel answered and said to her, "
The Holy Spirit will come upon you, and the power of the Highest will overshadow you; therefore, also, that Holy One who is to be
born will be called the
Son of God.
If you will notice, both had an angel appeared to Joseph and Mary informing them that they will become husband and wife and the child to be born named Jesus. The empowerment of the Holy Spirit that will overshadow Mary is from the Holy Spirit. I don't see any contradiction here but a perfect narrative match--to complete a perfect narrative--of the birth of Jesus Christ.
Thanks