[HarleyD]

At base this is all rooted in the idea of Original Sin and the absolute depravity of mankind after the Fall.

I wouldn't agree the Catholic Church errored in the idea of Original Sin and absolute depravity. The Catholic Church has errored in trying to reconcile the interpretation of the Theotokos with Original Sin. It can't be done. If you believe in Original Sin you can't believe that Mary was without sin.

[annalex]

If you believe in Original Sin you can't believe that Mary was without sin.

The Catholic belief is that original sin is removed through the grace of God at baptism, and holiness can be achieved through faith by grace. What Our Lady had in St. Anna's womb, is ours to have also, albeit by a different path.