Question, how do you know that God did not create the Blessed Mother as being sinless. do you think this is the first time this capability has been recorded?
I know you will get into Adam and Eve here, and try to draw a path. Sin entered the world through Adam when Adam sinned. He was made capable of sinning like Eve, cause they both did.
Romans 5:12
Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned.
Though Adam’s sin was the deliberate one, having received the command directly from God.
Gen 2
15 Then the Lord God took the man and put him in the garden of Eden to tend and keep it. 16 And the Lord God commanded the man, saying, “Of every tree of the garden you may freely eat; 17 but of the tree of the knowledge of good and evil you shall not eat, for in the day that you eat of it you shall surely die.”
Eve was deceived and fell into it
1 Timothy 2:14
And Adam was not deceived, but the woman being deceived, fell into transgression.
Adam just ate:
Gen 3
6 So when the woman saw that the tree was good for food, that it was pleasant to the eyes, and a tree desirable to make one wise, she took of its fruit and ate. She also gave to her husband with her, and he ate.
But Adam was capable of sin, as are we. And we have a sin nature (we want to sin). It is not some stain that needs to be washed.
But again, just because God is capable of something, does not mean he did it.
Jesus was without sin:
Hebrews 4:15
15 For we do not have a High Priest who cannot sympathize with our weaknesses, but was in all points tempted as we are, yet without sin.
He was not capable because of He being God in the flesh.
The notion of Mary’s sinlessness or immaculate conception are by no means necessary for Christ to have been born without sin Himself. His genealogy had many sinful people including prostitutes (Rahab). Jesus came and touched sinners with His hands to heal them. Nothing could stain Him