Thank you for your thoughtful question, David. It is one of those questions where theology, biology, and the mystery of the incarnation meet.
I think this is an excellent question because it touches on a mystery that Scripture deliberately leaves unexplained. That means we need to distinguish carefully between what Scripture clearly teaches, what we can reasonably infer, and what would merely be speculation.
The short answer is that Scripture never tells us exactly how the Holy Spirit accomplished the conception of Christ, so we should be careful not to be more specific than the Bible itself.
What Scripture does tell us is enough to establish several important truths.
đź“– 1. Jesus was truly born of Mary
The Bible repeatedly emphasizes that Jesus was genuinely Mary’s son.
Luke 1:31
“And behold, you will conceive in your womb and bring forth a Son, and shall call His name JESUS.”
Galatians 4:4
“But when the fullness of the time had come, God sent forth His Son, born of a woman, born under the law.”
Notice Paul doesn’t merely say Jesus passed through Mary’s womb. He says He was born of a woman.
Likewise, Jesus is repeatedly called:
- the son of Mary (Mark 6:3)
- the fruit of Mary’s womb (Luke 1:42)
Those expressions strongly suggest that Mary was His true mother, not merely a surrogate.
This also fits beautifully with the theme we explored in the discussion on “the seed of the woman.” Genesis 3:15 points to a Redeemer who truly comes from the woman.
🧬 2. Did Jesus receive Mary’s DNA?
Scripture never answers that question directly.
However, if Jesus did not receive anything biologically from Mary, several biblical themes become much weaker.
Hebrews insists that Christ truly shared our humanity.
Hebrews 2:14
“Since therefore the children share in flesh and blood, He Himself likewise partook of the same things…”
And a few verses later:
Hebrews 2:17
“Therefore, in all things He had to be made like His brethren…”
Similarly,
Romans 1:3
speaks of Christ as
“descended from David according to the flesh.”
If Jesus received no biological connection to Mary, it becomes difficult to explain how He could genuinely be David’s descendant “according to the flesh.”
For that reason, the overwhelming majority of Christian theologians throughout history have concluded that Jesus truly received His human nature from Mary.
✨ 3. But if Mary was a sinner, wouldn’t that make Jesus sinful?
This is really the heart of your question.
Many people assume that sin is transmitted through DNA.
The Bible never says that.
It certainly teaches that every ordinary human being is born under Adam’s fallen condition.
Romans 5:12
“Therefore, just as through one man sin entered the world, and death through sin…”
Notice Paul’s emphasis.
Sin entered through one man—Adam—not through chromosomes, DNA, or genetics.
Paul is describing humanity’s solidarity with Adam as our covenant head.
That means our sinful condition is primarily a theological reality before it is a biological one.
🕊️ 4. The Holy Spirit’s work is what made the conception unique
Luke emphasizes this point.
Luke 1:35
“The Holy Spirit will come upon you, and the power of the Highest will overshadow you; therefore also, that Holy One who
…to be born will be called the Son of God.”
Notice the logic of the verse.
It does not say, “because Mary is sinless.”
It does not say, “because Mary’s egg was bypassed.”
Instead, the holiness of Christ is attributed to the miraculous creative work of the Holy Spirit.
Just as the first Adam was directly formed by God from the dust without inheriting sin, the second Adam entered the world through a direct creative act of God within Mary’s womb (1 Corinthians 15:45–49). This doesn’t make Jesus less human—it makes His conception unique.
🌱 5. Is “man’s seed was corrupt” the biblical explanation?
I would make one small adjustment here.
It is certainly true that every ordinary descendant of Adam is born into a fallen race (Romans 5:12-19; Psalm 51:5).
However, Scripture never says that the physical seed itself became morally corrupt, nor does it teach that sin is biologically located in the sperm rather than the egg.
In fact, both Joseph and Mary were descendants of Adam. Both needed a Savior.
Mary herself rejoices,
Luke 1:46-47
“My soul magnifies the Lord, and my spirit has rejoiced in God my Savior.”
She never presents herself as exempt from humanity’s need of redemption.
So the miracle is not that one biological component was “clean” while the other was “unclean.”
The miracle is that God Himself intervened, bringing about a conception unlike any other in history.
🤔 6. Could God have used only Mary’s womb and not her egg?
Theoretically, because God is omnipotent, He could have done anything consistent with His purposes.
But here’s where I would be cautious.
There is no biblical text that suggests Mary’s egg was not involved.
In fact, several passages seem to point in the opposite direction.
Jesus is:
- the offspring of David (Romans 1:3)
- the seed of Abraham (Hebrews 2:16)
- born of a woman (Galatians 4:4)
- the fruit of Mary’s womb (Luke 1:42)
All of these expressions naturally point toward a genuine biological relationship.
If Mary contributed nothing biologically, then she functioned merely as a gestational carrier rather than as Christ’s true mother. That seems difficult to reconcile with the consistent biblical witness.
✨ 7. The greater miracle is not the absence of Mary’s DNA
Personally, I think the greater miracle is actually the opposite.
The miracle is that the eternal Son truly became one of us.
As we discussed in the article, God did not merely pass through humanity—He entered it completely. The Son was “born of a woman,” truly sharing our flesh and blood while remaining completely without sin. That is part of the breathtaking beauty of the Incarnation.
If Jesus received Mary’s humanity yet remained perfectly holy, then we are witnessing something even greater than a biological workaround. We are witnessing the Creator sanctifying human nature by assuming it Himself without ever becoming contaminated by sin.
🙏 Conclusion
So I would gently answer your question this way:
I don’t think you’re “barking up the wrong tree.” You’re asking a thoughtful question that Christians have wrestled with for centuries.
However, I don’t think Scripture leads us to conclude that Mary contributed only a womb and no genetic material.
Rather, the biblical evidence points in the opposite direction: Jesus was genuinely Mary’s son, sharing her humanity and likely her biological nature, while His conception was miraculously brought about by the Holy Spirit, preserving Him from Adam’s fallen condition.
In other words, Jesus’ sinlessness does not require the absence of Mary’s DNA; it requires the miraculous action of God.
That, perhaps, is the greatest lesson of the Incarnation. The Holy Spirit did not protect the Son from becoming truly human. He enabled the Son to become truly human without ever ceasing to be the Holy One of God (Luke 1:35; John 1:14; Hebrews 4:15).