http://carm.org/isaiah-7-14-virginAn interesting article. If virgin in fact translates to young woman, then this is another argument for the falsehood of Islam. As Islam without a doubt states that Jesus was born without a father. Therefore this shows how Prophet Muhammad essentially copied and pasted different beliefs and myths from other religions into his own religion.
It doesn't matter what you say, or find evidence for, or what you disprove, the stubborn grip that Islam holds on the majority of it's followers will remain in place. There are already a thousand proofs and arguments out there, that should be enough to dissuade logical minds away from the religion. But these are mostly not logical minds that you are dealing with. They are minds that are closed. They are minds that are high and reliant on their religious drug. They are minds that are in denial, and that will turn to any weak counter-argument or conspiracy to fend off your evidence.
Most will ignore your evidence. Others will find a ridiculous argument to latch onto. Others still will say that the evidence has been planted by gay American Jewish Freemasons. You will not win many over with your proof. All you can hope to do is add to the mountain of evidence that already exists, in the hope that a few more may join our ranks. One day, those ranks may swell enough to form an unstoppable avalanche. But unfortunately, that day seems pretty distant to me right now.