Is It Important to Believe in the Virgin Birth?

Grudem argues that it is:

It has been common, at least in previous generations, for those who do not accept the complete truthfulness of Scripture to deny the doctrine of the virgin birth of Christ. But if our beliefs are to be governed by the statements of Scripture, then we will certainly not deny this teaching. Whether or not we could discern any aspects of doctrinal importance for this teaching, we should believe it first of all simply because Scripture affirms it. Certainly such a miracle is not too hard for the God who created the universe and everything in it—anyone who affirms that a virgin birth is “impossible” is just confessing his or her own unbelief in the God of the Bible. Yet in addition to the fact that Scripture teaches the virgin birth, we can see that it is doctrinally important, and if we are to understand the biblical teaching on the person of Christ correctly, it is important that we begin with an affirmation of this doctrine.

Wayne A. Grudem, Systematic Theology : An Introduction to Biblical Doctrine (Grand Rapids, MI: Zondervan Pub. House, 1994), 532.