Therefore the Lord himself will give you a sign: The virgin will be with child and will give birth to a son, and will call him Immanuel. Isaiah 7:14
Immanuel of course means "god with us" so Jesus was god, thus Immanuel, and born of Mary the Virgin. But there is a problem here. Lets ignore the translation issues with "virgin" that everyone knows about but christians justify away and do what christians tell us to. Lets read it in context and find out what this is all really about. I'll quote most of Chapter 7 of Isaiah to prove the point.
1. When Ahaz son of Jotham, the son of Uzziah, was king of Judah, King Rezin of Aram and Pekah son of Remaliah king of Israel marched up to fight against Jerusalem, but they could not overpower it.
2. Now the house of David was told, "Aram has allied itself with Ephraim"; so the hearts of Ahaz and his people were shaken, as the trees of the forest are shaken by the wind.
3. Then the LORD said to Isaiah, "Go out, you and your son Shear-Jashub, to meet Ahaz at the end of the aqueduct of the Upper Pool, on the road to the Washerman's Field.
4. Say to him, 'Be careful, keep calm and don't be afraid. Do not lose heart because of these two smoldering stubs of firewood—because of the fierce anger of Rezin and Aram and of the son of Remaliah.
5. Aram, Ephraim and Remaliah's son have plotted your ruin, saying,
6. "Let us invade Judah; let us tear it apart and divide it among ourselves, and make the son of Tabeel king over it."
7. Yet this is what the Sovereign LORD says:
" 'It will not take place,
it will not happen,
8. for the head of Aram is Damascus,
and the head of Damascus is only Rezin.
Within sixty-five years
Ephraim will be too shattered to be a people.
9. The head of Ephraim is Samaria,
and the head of Samaria is only Remaliah's son.
If you do not stand firm in your faith,
you will not stand at all.' "
10. Again the LORD spoke to Ahaz,
11. "Ask the LORD your God for a sign, whether in the deepest depths or in the highest heights."
12. But Ahaz said, "I will not ask; I will not put the LORD to the test."
13. Then Isaiah said, "Hear now, you house of David! Is it not enough to try the patience of men? Will you try the patience of my God also?
14. Therefore the Lord himself will give you a sign: The virgin will be with child and will give birth to a son, and will call him Immanuel.
15. He will eat curds and honey when he knows enough to reject the wrong and choose the right.
16. But before the boy knows enough to reject the wrong and choose the right, the land of the two kings you dread will be laid waste.
17. The LORD will bring on you and on your people and on the house of your father a time unlike any since Ephraim broke away from Judah—he will bring the king of Assyria."
And there you have it, plain as day. The "prophecy" is a prophecy to Ahaz that he will not be destroyed by Assyria and that his son will be born and he will be a good king. Before his son is even old enough to know right from wrong, the lands he fears will be laid to waste and things will be good for him and his family, better than ever before. CLEARLY this is about Ahaz! Christians like to talk about Cherry picking, but come on, this is possibly the worst case of cherry picking I have ever seen.
Jesus was never called Immanuel, and the scripture is clearly not about him. So much for messianic aspirations of Jesus in the Old Testament.