This thread is absolutely incredible. Why not fling actual mud at your computer screens, folks?
Or consider the option of going back to Bible.
I read ONE post (and I'm so sorry I don't remember who posted it) which mentioned Genesis 3:15.
YES. The seed of the woman. That is virgin birth, folks. No possible options.
The Isaiah prophecy is the one which is often said to be doubtful about it meaning virgin, as the word there is 'alma,' meaning 'young girl.' The presumption was, however, that young girls were virgins!
Matthew wrote his gospel to show the Jews how Jesus fulfilled prophecy, so they would understand that Jesus was the Messiah. Matthew would NOT have used anything that the Jews would have disagreed with regarding the meaning of words. When, in Matthew 1:23, Matthew refers to the Isaiah prophecy, he quotes it using the Greek word "parthenos", meaning 'maiden,' or 'unmarried daughter,' which is virtually synonymous with virgin and, in fact, is simply a form of the word "parthenia" meaning "maidenhood; virgin."
Is this word used as virgin explicitly in other places in the New Testament? Absolutely!
Luke 1:26-27
In the sixth month, God sent the angel Bagriel t Nazareth, a town in Galilee, to a virgin [parthenos] pledged to be married to a man named Joseph, a descendant of David. The virgin's [parthenos] name was Mary.
1 Corinthians 7:25-38
Now, about virgins [parthenos]: I have no command from the Lord, but I give a judgment as one who by the Lord's mercy is trustworthy. Because of the present crisis, I think that it is good for you to remain as you are. Are ou married? Do not seek a divorce. Are you unmarried? Do not look for a wife. But if you do marry, you have not sinned; and if a virgin [parthonos] marries, she has not sinned. But those who marry will face many troubles in this life, and I want to spare you this.
What I mean, brothers, is that the time is short. From now on those who have wives should live as if they had none; those who mourn, as if they did not; those who are happy, as if they were not; those who buy something, as if it were not theirs to keep; those who use the tings of the world, as if not engrossed in them. For this world in its present form is passing away.
I would like you to be free from concern. An unmarried man is concerned about the Lord's affairs -- how he can please the Lord. But a married man is concerned about the affairs of this world -- how he can please his wife -- and his interested are divided. An unmarried woman or virgin [parthenos; note this is mentioned as separate from simply being unmarried] is concerned about the Lord's affairs. Her aim is to be devoted to the Lord in both body and spirit. But a married woman is concerned about the affairs of this world -- how she can please her husband. I am saying this for your own good, not to restrict you, but that you may live in a right way in undivided devotion to the Lord.
If anyone thinks he is acting improperly toward the virgin [parthenos] he is engaged to, and if she is getting along in years [this is definitely not a young girl, then!], he should do as he wants. He is not sinning. They should get married. But the man who has settled the matter in his own mind, who is under no compulsion but has control over his own will, and who has made up his mind not to marry the virgin -- this man also does the right thing. So then, he who marries the virgin does right, but he who does not marry her does even better.
2 Corinthians 11:2
I am jealous for you with a godly jealousy. I promised you to one husband, to Christ, so that I might present you as a pure virgin to him.
Is there ANY question about the way Paul was using this word? I think not.
There are a number of other times 'parthenos' is used in the New Testament. It always means a woman who is not defiled via sex. The one exception to that meaning is in Revelation 14:4.
The virgin birth of Christ is not simply tradition, as I hope it is clear from the passages above! It is a biblical doctrine and has been traditionally accepted that way. It is not the tradition which validates it, though, but the Bible itself.