Well guess who did?!
Pray to Our Lady, saying to her: It was to you as the Woman that was given the power to crush the head of the serpent who lied to men that they would be like unto gods.
And notice he continues to repeat the false belief it was Mary being referenced in Genesis 3:15.
And why do we know this is incorrect?
The sentence against the first parents was accompanied by the Earliest Gospel (Proto-evangelium), which put enmity between the serpent and the woman: "and I will put enmity between thee and the woman and her seed; she (he) shall crush thy head and thou shalt lie in wait for her (his) heel" (Genesis 3:15). The translation "she" of the Vulgate is interpretative; it originated after the fourth century, and cannot be defended critically. http://www.newadvent.org/cathen/07674d.htm
But does this stop Roman Catholicism from their error??
Nope.
“But does this stop Roman Catholicism from their error??”
Thanks for the link, but you stopped reading too soon. Immediately following is:
The conqueror from the seed of the woman, who should crush the serpent’s head, is Christ; the woman at enmity with the serpent is Mary. God puts enmity between her and Satan in the same manner and measure, as there is enmity between Christ and the seed of the serpent. Mary was ever to be in that exalted state of soul which the serpent had destroyed in man, i.e. in sanctifying grace. Only the continual union of Mary with grace explains sufficiently the enmity between her and Satan. The Proto-evangelium, therefore, in the original text contains a direct promise of the Redeemer, and in conjunction therewith the manifestation of the masterpiece of His Redemption, the perfect preservation of His virginal Mother from original sin.