There’s no reason to call Matthew a con artist. I would assume that Matthew believed what he said. It’s likely that he was passing on a common tradition, since Luke also has the Virgin Birth.
Yes, of course, hedrick. I agree. And perhaps I should have laid out the question with more of a C.S. Lewis style insinuation in mind, that the writers who articulated their respective Virgin Birth narratives were in one of a few possible categories, depending on what the facts of reality (and history) really are:
Liars, Lunatics, or the Lord's penmen.
If it helps, I'll just specify here to everyone that I do believe in the Virgin Birth of Christ, and that I believe that, however imperfectly executed, the writer's of Matthew's and Luke's Gospels reflect the divine inspiration by which they were motivated to write. I believe they were the Lord's penmen, even if my formulation of the exact nature of their writing isn't shared by my more fundamentalist brothers and sisters.
Paul’s statements are usually taken as evidence against the Virgin Birth. In context that verse refers to a normal Jewish birth. While his statements aren’t completely inconsistent with the Virgin Birth, they would seem odd for someone who accepted it.
I find it odd when certain scholars take Paul's statement as being "against" the virgin birth. At worst, his thoughts were probably more along the line that it's specificity wasn't a decisive theme (or necessarily a verifiable fact). And yes, I think everyone should be mindful that Paul's statements are not at all inconsistent with the Virgin Birth; he just doesn't explicate it as do the later Gospels of Matthew and Luke.
The idea of God as Father does not imply anything about the Virgin Birth. After all, Jesus encouraged us all to call God Father.
While I agree that Paul's motif of God being the "Father" of Jesus doesn't succinctly imply a Virgin Birth, I think the overall context of what Paul states in Galatians 4:4 does, at the least, imply a special and perhaps miraculous birth for Jesus.
For instance, Paul states that Jesus' birth was contingent upon it's taking place at a particular time within the scheme of God's eschaton; it couldn't just happen at anytime, neither could it just happen for anyone. So, Jesus couldn't just be ANY son of a god. No, we need to be clear that Paul states that Jesus came in the "fullness of the time," for a specific purpose at the behest of Jesus' Father, via a mortal woman (with no accompanying mention of any kind of man), born into a specific culture (i.e. a Jewish one under the Mosaic Law), to redeem those under the Law so they could become "adopted" sons and daughters, i.e. sons and daughters who are not begotten of God, but rather born-again through the adoptive process of the Holy Spirit. All of which accords, of course, with the Nicene Creed and so on.
So, for us to underestimate how Paul's statement in Galatians 4:4 supports the more specific statements made by the writers of Matthew's and Luke's Gospel is not really an open option for Christians.
If this was a legend, then that whole part of the birth story was a legend. Most people who reject the Virgin Birth assume a normal, licit, sexual relationship with Joseph. Some have, however, considered the possibility of rape.
Yes, but if we slam the Virgin Birth, to be consistent, we should also slam the birth of John the Baptist as told by Luke. They hang together. The problem for skeptics is that Luke's representation of these kinds of births already have numerous precedents in the OT and are consistent with the kind of work, even surprising work, we'd expect from the God of the Hebrews/Jews.
Not only this, but I'd find it very surprising if Paul was unaware of Isaiah 53:2, which I take as a cryptic allusion to the possibility of a virgin style birth of "the Branch" who Isaiah foretold was to come. The confluence of all of these seemingly disparate pieces in not only Isaiah, but strewn throughout the OT, should have led to Paul's writing of Galatians 4:4. How else would it have happened? What's more likely, that Paul (or even Matthew and Luke) took most of his ideas about Christ from the OT, or instead from previous pagan pseudo-virgin birth stories. [Oh...let's do a Bayesian analysis--that will solve it for us.

]
Lastly, I think we need to consider one historical fact that seems to play into the possibility of a virgin birth for Jesus: i.e. the known accusation that He was born out of wedlock, with the insinuation by Jesus' detractors that He was of illegitimate birth. And of this fact, I like what John Stott (1985) has to say:
These rumors of Jesus' illegitimacy persisted long after his death. In the Jewish Talmud they became explicit. And in the third century the Christian scholar Origen had to answer the jibe of the critic Celsus that Joseph turned Mary out of his home because she had committed adultery with a soldier named Panthera. How on earth could these hints and slanders have arisen unless it were known that Mary was already pregnant when Joseph married her? Distasteful as this gossip is, it is corroborative evidence of the virgin birth. (p. 66)
Please note that this discussion is difficult, because CF rules do not permit one to reject the Virgin Birth. That means that people may be “pulling their punches,” and you may not be seeing a full presentation of the arguments.
Well, that's too bad, isn't it?
Peace
2PhiloVoid
Reference
Stott, J. R. (1985).
Authentic Jesus. Intervarsity Press.