Al Mohler- Can a Christian Deny the Virgin Birth?

No is the answer. here's an extract from the entire article.

'Christians must face the fact that a denial of the virgin birth is a denial of Jesus as the Christ. The Savior who died for our sins was none other than the baby who was conceived of the Holy Spirit, and born of a virgin. The virgin birth does not stand alone as a biblical doctrine, it is an irreducible part of the biblical revelation about the person and work of Jesus Christ. With it, the Gospel stands or falls.

"Everyone admits that the Bible represents Jesus as having been conceived by the Holy Ghost and born of the Virgin Mary. The only question is whether in making that representation the Bible is true or false." So declared J. Gresham Machen in his great work, The Virgin Birth of Christ. As Machen went on to argue, "if the Bible is regarded as being wrong in what it says about the birth of Christ, then obviously the authority of the Bible in any high sense, is gone."
The authority of the Bible is almost completely gone where liberal theology holds its sway. The authority of the Bible is replaced with the secular worldview of the modern age and the postmodern denial of truth itself. The true church stands without apology upon the authority of the Bible and declares that Jesus was indeed "born of a virgin." Though the denial of this doctrine is now tragically common, the historical truth of Christ's birth remains inviolate. No true Christian can deny the virgin birth.'