We should just call this thread- Jack deconstructs the Nativity. 
Your argument assumes Markan priority, which is by no means clear. If Matthew was written before Mark, than why would they add the Nativity? There is no evidence contradicting biblical testimony of Jesus' birth in Bethlehem, and none in support of your unlikely scenario.
1. Micah 5:2-7
You are right in that Micah was not talking about Jesus, but rather the promised Messiah. In order to support his case for Jesus as the Messiah, Matthew cites Micah 5:2 reminding Jews that the promised Messiah would be born in Bethlehem, which Jesus fulfilled. Micah 5:6 is not used here by Matthew, as this is an entirely different prophecy.
2. Isaiah 7:14
The hinge of your percieved contradiction between Matthew 1:22 and Isaiah is the single word virgin.
as in Isaiah 7:14:
'The virgin will be with child and will give birth to a son, and he will call him Immanuel.'
One interpretation is that virgin means a young woman about to be betrothed. The same hebrew word is also used in Gen 24:43:
"See I am standing beside this spring; if a maiden comes out to draw water and I say to her, 'Please let me drink a little water from the jar.' "
The NIV translates this word as maiden. It is expected that a young woman about to be married will be a virgin.
Isaiah predicted that a virgin would concieve, which was fulfilled through the Holy Spirit, conceiving Jesus.
You cannot understand the second part of the prophecy without translating the name E(I)mmanuel, which means 'God is with us'.
This is fulfilled at Jesus' birth when an angel of the Lord appears to Joseph, saying that their son would save his people from their sins. In the OT, only God, or Yahweh can save people from their sins. Therefore, the angel asserts that the child of Mary is God, and that with His birth, God is with them.
"What use is a "sign" that won't appear for centuries?"
God follows his own timetable, not that of man. He will wait until the time is right.
3. Matthew 2:16-18
Matthew 2:16-18 does not refer to Jesus, nor is it intended to. Matthew clearly demonstrates a familiarity with Hebrew and the OT, when explaining the fulfillment of Jeremiah 31:15, as King Herod attempts to slaughter all the Jewish children.
4. Matthew 21:7
"But Matthew misinterprets the expression and refers to Jesus riding two animals (presumably like a circus performer, one foot on each): he doesn't understand Hebrew."
Clever, yet you do not cite Luke 19:30-35 or Mark 11:2-7. Both say that he rode the colt alone, and do not mention a second animal. Look, a real contradiction in the Gospels, yet you fail to mention it. What a shame.
No- the offending passage in the NIV, Matthew 21:7
"They brought the donkey and the colt, placed their cloaks on them, and Jesus sat on them. "
The object of them are the cloaks and not the donkeys.
Jesus sat on the cloaks, as some were placed on the colt, and others on the donkey.
Finally, Matthew only cites Zechariah 9:9 as fulfilled on Palm Sunday, heralding the triumphant return of Jesus to Jerusalem. Zech 10-15 is a seperate prophecy.
Even so, a military ruler will not disarm, taking away the chariots, rather than destroying, and does not proclaim peace to the nations, all the nations not just Israel. Both these will occur, but not until the end-times.
Answer my question I posed earlier- I only had one, and you have had many:
What makes a Christian a Christian?

Your argument assumes Markan priority, which is by no means clear. If Matthew was written before Mark, than why would they add the Nativity? There is no evidence contradicting biblical testimony of Jesus' birth in Bethlehem, and none in support of your unlikely scenario.
1. Micah 5:2-7
You are right in that Micah was not talking about Jesus, but rather the promised Messiah. In order to support his case for Jesus as the Messiah, Matthew cites Micah 5:2 reminding Jews that the promised Messiah would be born in Bethlehem, which Jesus fulfilled. Micah 5:6 is not used here by Matthew, as this is an entirely different prophecy.
2. Isaiah 7:14
The hinge of your percieved contradiction between Matthew 1:22 and Isaiah is the single word virgin.
as in Isaiah 7:14:
'The virgin will be with child and will give birth to a son, and he will call him Immanuel.'
One interpretation is that virgin means a young woman about to be betrothed. The same hebrew word is also used in Gen 24:43:
"See I am standing beside this spring; if a maiden comes out to draw water and I say to her, 'Please let me drink a little water from the jar.' "
The NIV translates this word as maiden. It is expected that a young woman about to be married will be a virgin.
Isaiah predicted that a virgin would concieve, which was fulfilled through the Holy Spirit, conceiving Jesus.
You cannot understand the second part of the prophecy without translating the name E(I)mmanuel, which means 'God is with us'.
This is fulfilled at Jesus' birth when an angel of the Lord appears to Joseph, saying that their son would save his people from their sins. In the OT, only God, or Yahweh can save people from their sins. Therefore, the angel asserts that the child of Mary is God, and that with His birth, God is with them.
"What use is a "sign" that won't appear for centuries?"
God follows his own timetable, not that of man. He will wait until the time is right.
3. Matthew 2:16-18
Matthew 2:16-18 does not refer to Jesus, nor is it intended to. Matthew clearly demonstrates a familiarity with Hebrew and the OT, when explaining the fulfillment of Jeremiah 31:15, as King Herod attempts to slaughter all the Jewish children.
4. Matthew 21:7
"But Matthew misinterprets the expression and refers to Jesus riding two animals (presumably like a circus performer, one foot on each): he doesn't understand Hebrew."
Clever, yet you do not cite Luke 19:30-35 or Mark 11:2-7. Both say that he rode the colt alone, and do not mention a second animal. Look, a real contradiction in the Gospels, yet you fail to mention it. What a shame.
No- the offending passage in the NIV, Matthew 21:7
"They brought the donkey and the colt, placed their cloaks on them, and Jesus sat on them. "
The object of them are the cloaks and not the donkeys.
Jesus sat on the cloaks, as some were placed on the colt, and others on the donkey.
Finally, Matthew only cites Zechariah 9:9 as fulfilled on Palm Sunday, heralding the triumphant return of Jesus to Jerusalem. Zech 10-15 is a seperate prophecy.
Even so, a military ruler will not disarm, taking away the chariots, rather than destroying, and does not proclaim peace to the nations, all the nations not just Israel. Both these will occur, but not until the end-times.
Answer my question I posed earlier- I only had one, and you have had many:
What makes a Christian a Christian?
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