Though biblical evidence of the virgin birth is overwhelming, it does not prove the virgin birth. The virgin birth, like the resurrection of Jesus, must be accepted ultimately by faith — but not by blind faith. It is faith based upon factual evidence and the testimony of the Holy Spirit.
The world sneers and screams, "It is impossible!" The Angel Gabriel said to Mary, "With God nothing is impossible!"
What the world so desperately needs today is the simple child-like faith of Mary. Another thing all of us so desperately need is the willingness of Mary to yield her life to the Lord's will, regardless of the circumstances. Remember Mary's brave words: "Behold, I am the bondslave of the Lord; be it done to me according to your word" (Luke 1:37). Mary spoke those words knowing that she could likely suffer execution or public humiliation.
It is no wonder that the Word says Mary will be called "blessed" by all generations (Luke 1:48).
One thing is certain. The virgin birth is not irrelevant. It is essential to the deity of Jesus. And the deity of Jesus is essential, in turn, if His death had any meaning at all. Paul ties it all together in Galatians 4:4-5: "God sent forth His Son, born of a woman, born under the Law in order that He might redeem those who were under the Law, that we might receive the adoption as sons."
To deny the virgin birth is to deny the deity of Jesus, for without the virgin birth Jesus is just another man born with the flawed sin nature inherited by all of us from Adam. And if Jesus is just a man, then we have no hope whatsoever.
[Watch the "Christ in Prophecy" television show The Essentiality and Validity of the Virgin Birth!]