So, you have a sign given for king Ahaz that if it was to be applied to Jesus.....would be worthless for king Ahaz. Jesus doesnt show up for 700 years.
Also, the Jewish scribes translated the Torah only into Greek. It was the Christians who translated the rest, including Isaiah and the apocryphal books.
It G-d would have wanted to make the point that the woman in Isaiah 7 was a virgin, he would have used betulah like he did in Gen 24:16 where Rebekah is called a Maiden and a Virgin.
Also, Isaiah had three sons, whose names reflected G-ds work at the time. His third son was Immanuel. Jesus name in the greek is Joshua, not Immanuel. Many Jewish names contain the name of G-d. NEVER has ANY of these people been considered divine....just because there name contains the name of G-d.
So your unstated but obvious conclusion is that Jesus was a mad man. Got it. Have you ever spent any time reading C.S. Lewis? You might, might, learn a thing or two about Christianity.