Bible Answer

Did Jesus inherit sin through Mary?

Since Mary carried sin her flesh, why didn't she pass it along to Jesus along with the curse upon humanity? 

The word of God says the sin nature of humanity transfers from one generation to another through the reproductive process:

Rom. 5:12  Therefore, just as through one man sin entered into the world, and death through sin, and so death spread to all men, because all sinned —

Spiritually speaking, our sin nature is passed through the man (i.e., the "seed"). David confirms that sin passes to us in the moment of conception:

Psa. 51:5 Behold, I was brought forth in iniquity, 
    And in sin my mother conceived me.

But since Christ was formed in Mary’s womb by the Holy Spirit, and not by the seed of men, He did not possess a sin nature. We see evidence of this distinction in Genesis 3 where the Lord foretold the virgin birth of the Messiah:

Gen. 3:14      The LORD God said to the serpent, 
    “Because you have done this, 
    Cursed are you more than all cattle, 
    And more than every beast of the field; 
    On your belly you will go, 
    And dust you will eat 
    All the days of your life;
Gen. 3:15      And I will put enmity 
    Between you and the woman, 
    And between your seed and her seed; 
    He shall bruise you on the head, 
    And you shall bruise him on the heel.”

The mention of a woman's seed is a reference to the Holy Spirit's conception of Jesus within Mary. He  Importantly, a woman doesn't possess "seed" in the Bible's sense of that word, and yet here the Bible says the Messiah will be conceived by a woman's "seed," which is intentional to make the point that the Messiah would not be conceived in the normal way (I,.e., by a man's seed) but rather would be conceived in a woman without the help of a man. 

Furthermore, there is no evidence that any material from Joseph or Mary was used in the conception of Jesus or passed to Jesus, according to Luke:

Luke 1:30 The angel said to her, “Do not be afraid, Mary; for you have found favor with God.
Luke 1:31 “And behold, you will conceive in your womb and bear a son, and you shall name Him Jesus.
Luke 1:32 “He will be great and will be called the Son of the Most High; and the Lord God will give Him the throne of His father David;
Luke 1:33 and He will reign over the house of Jacob forever, and His kingdom will have no end.”
Luke 1:34 Mary said to the angel, “How can this be, since I am a virgin?”
Luke 1:35 The angel answered and said to her, “The Holy Spirit will come upon you, and the power of the Most High will overshadow you; and for that reason the holy Child shall be called the Son of God.

The sense of the text was that the Holy Spirit conceived the child inside Mary. Conception naturally involves a man and woman, but since Mary was a virgin the normal process was not used to conceive Jesus. He was formed like the original Adam: by God directly. Mary essentially became a surrogate mother carrying the child, but her body did not conceive the child. 

So since Jesus wasn't conceived by the seed of men or even by the body of Mary, He did not posses original sin, which is passed to us through the normal conception process, and therefore Jesus didn't inherit the sin of Adam. 

Scripture quotations taken from the (NASB®) New American Standard Bible®, Copyright © 1995, 2020 by The Lockman Foundation. Used by permission. All rights reserved. www.lockman.org