Matthew 1
1 The book of the generation of Jesus Christ, the son of David, the son of Abraham.
2 - 15 was a lot of begetting
16 And Jacob begat Joseph the husband of Mary, of whom was born Jesus, who is called Christ.
17 So all the generations from Abraham to David are fourteen generations; and from David until the carrying away into Babylon are fourteen generations; and from the carrying away into Babylon unto Christ are fourteen generations.
18 Now the birth of Jesus Christ was on this wise: When as his mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost.
19 Then Joseph her husband, being a just man, and not willing to make her a public example, was minded to put her away privily.
20 But while he thought on these things, behold, the angel of the LORD appeared unto him in a dream, saying, Joseph, thou son of David, fear not to take unto thee Mary thy wife: for that which is conceived in her is of the Holy Ghost.
21 And she shall bring forth a son, and thou shalt call his name JESUS: for he shall save his people from their sins.
22 Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying,
23 Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.
24 Then Joseph being raised from sleep did as the angel of the Lord had bidden him, and took unto him his wife:
25 And knew her not till she had brought forth her firstborn son: and he called his name JESUS.
Isaiah 7
14 Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel.
If you go to the link, and do a bible search on key parts of the prophecy, the only thing close to a match is Isaiah 7:14
So, was Isaiah a prophecy, spoken by God, about Jesus? There are many that believe that.
See Here
Or Here
The fact is that the prophecy was about an event that was soon to happen. If you read the preceding, and a couple of the following chapters of Isaiah you will see that it did happen.
There is much dispute about the use of the word Virgin in the Isaiah passage. My limited research has convinced me that even those that speak Hebrew dispute if the word used meant Virgin, or Young Maiden. Some say it could be either, some say in the context used it would or could mean Virgin, others say in context it would or could mean young maiden. I don't know.
There is also some question about the phrase "shall conceive". Some say it should be past tense (has conceived), some disagree.
It would have been nice if God had inspired his writers to use less ambiguous wording.
Just to offer some proof that I'm not making these things up, here is how some of the other translations deal with these problems.
Isaiah 7 (Contemporary English Version)
14 But the LORD will still give you proof. A virgin [c] is pregnant; she will have a son and will name him Immanuel.
c:Isaiah 7:14 virgin: Or "young woman." In this context the difficult Hebrew word did not imply a virgin birth. However, in the Greek translation made about 200 (B.C. )and used by the early Christians, the word parthenos had a double meaning. While the translator took it to mean "young woman," Matthew understood it to mean "virgin" and quoted the passage (Matthew 1.23) because it was the appropriate description of Mary, the mother of Jesus.
Isaiah 7 (The Message)
So the Master is going to give you a sign anyway. Watch for this: A girl who is presently a virgin will get pregnant. She'll bear a son and name him Immanuel (God-With-Us).
Isaiah 7 (Amplified Bible)
14 Therefore the Lord Himself shall give you a sign: Behold, the young woman who is unmarried and a virgin shall conceive and bear a son, and shall call his name Immanuel [God with us].
The reasoning given by most Christians that believe this prophecy pertains to Jesus, is that it is a double prophecy, with both an immediate and a future fulfillment. As we saw on the earlier prophecies, people have a tendency to take what the Bible says, and add or remove whatever it takes to get the meaning they already believe it to say. Some rewordings are based on interpretations that involve understanding of "hidden" meaning. And of course the reason they see the "true" meaning" of the Bible is because they have faith, and that clears their eyes to see the true message of God. I think it could be argued that in fact, their faith has blinded them to the generally simple words used in the Bible (if you avoid Daniel and Revelations

). But I suspect this will be a stumbling block between Theist and Atheist concerning the Bible forever, or at least a very long time.
There is another problem with the chapter from Matthew. It indicates that Jesus is descendant from David, a requirement to make him the Messiah. However, we are told that Mary and Joseph were only engaged, not married, and that it was a virgin conception. Jesus' bloodline could not have come from David unless Joseph had been the one to impregnate Mary. This leaves the conflicted position that Jesus was either born of a virgin, and not from the line of David, or was the true son of Joseph, and not born of a virgin. No doubt there is some hidden meaning involved here also
