Must We Believe the Virgin Birth?

I just read a great article by R. Albert Mohler, Jr. on Christian Post. Great apologetic for the Virgin Birth. Praise God for His gift of His own begotten Son Jesus, born of a virgin, fully God and fully man.

Who, being in very nature God, did not consider equality with God something to be grasped, but made himself nothing, taking the very nature of a servant, being made in human likeness. And being found in appearance as a man, he humbled himself and became obedient to death—even death on a cross! Therefore God exalted him to the highest place and gave him the name that is above every name, that at the name of Jesus every knee should bow, in heaven and on earth and under the earth, and every tongue confess that Jesus Christ is Lord, to the glory of God the Father, (Philippians 2:6-11, NIV).