(An except from “Must We Believe The Virgin Birth?” from AlbertMohler.com Wednesday, December 22, 2010)
Matthew tells us that before Mary and Joseph “came together,” Mary “was found to be with child by the Holy Spirit.” [Matthew 1:18] This, Matthew explains, fulfilled what Isaiah promised: “Behold, the virgin shall be with child and shall bear a Son, and they shall call His name ‘Immanuel,’ which translated means ‘God with Us’.” [Matthew 1:23, Isaiah 7:14]
Luke provides even greater detail, revealing that Mary was visited by an angel who explained that she, though a virgin, would bear the divine child: “The Holy Spirit will come upon you, and the power of the Most High will overshadow you; and for that reason the holy child shall be called the Son of God.” [Luke 1:35]
Even if the Virgin Birth was taught by only one biblical passage, that would be sufficient to obligate all Christians to the belief. We have no right to weigh the relative truthfulness of biblical teachings by their repetition in Scripture. We cannot claim to believe that the Bible is the Word of God and then turn around and cast suspicion on its teaching.
Millard Erickson states this well: “If we do not hold to the virgin birth despite the fact that the Bible asserts it, then we have compromised the authority of the Bible and there is in principle no reason why we should hold to its other teachings. Thus, rejecting the virgin birth has implications reaching far beyond the doctrine itself.”