Luke 3:38 And The Virgin Birth

The reference to Adam as "the son of God" in Luke 3:38 is unusual. And Jesus had just been referred to as the Son of God in Luke 3:22, right before the genealogy. The concept of Jesus' being the Son of God is a prominent theme in early Christianity, in Luke's writings and elsewhere. The similar terminology involved in the references to Jesus and Adam, the proximity between the references to Jesus' Sonship and Adam's, and the unusualness of referring to Adam as a son of God make more sense if Luke is paralleling the two.

They can be paralleled in multiple ways. Adam's initial sinlessness is reminiscent of Jesus' sinlessness, Adam's initial good relationship with God is reminiscent of Jesus' good relationship with the Father, etc. But the reference to Adam's sonship is in a genealogy, so it makes the most sense to focus on a parallel in terms of origins or begetting.

That doesn't single out a virgin birth. Jesus, in his humanity, could have been created without a father or mother, as Adam was. But the parallel could also be partial, so that Jesus' humanity comes from God's intervention, without sexual intercourse, even though he has one or more human parents. Isaac is referred to in the genealogy as the son of Abraham (verse 34), without being referred to in any unusual way, unlike Adam, which provides some evidence that Luke has something more in mind than just the sort of Divine intervention involved in Isaac's conception. The wording of verse 38 doesn't single out the virgin birth, but it leads us in the direction of some sort of Divine intervention in Jesus' origins beyond what we see with Isaac. The larger context, in Luke's gospel and in early Christianity more broadly, provides us with further information, including the fact that Jesus was born of a virgin. Most likely, both Luke 3:23 and 3:38 are alluding to the virgin birth.

That provides us with another example of how the material in Luke 1-2 is reflected in later chapters of the gospel, despite what critics often allege to the contrary. For other examples, see here.