Actually the line "she (his mother) shall call him Emmanuel" is not in Matthew. It's in Isaiah 7:14. Jesus is not called Emmanuel anywhere in the New Testament. It's supposed to be a fulfilled prophecy, but there's no evidence that the passages in Isaiah are referring to Jesus at all. Even if they were, it's not any sort of fulfilled prophecy, because Jesus is just a character in a book written by someone who could have read the older parts, and then claimed prophecy fulfilled. It's like me making a prophecy that the word "sentence" will be the last word in this sentence.
Christian apologetics is the art of rolling a dog turd in sugar and selling it as a donut.
