Q2-- So, if Adam and Eve were born without sin, but they Fell, and took the rest of Humanity down with them— do you think that God was incapable of preserving at least one person from the effects of that Fall? And if he was going to preserve at least one person from the effects of the Fall, why not the one he had prepared to be his Mother?
What is Sin? Sin is what separates us from God. Jesus only spent three years in public ministry. But he spent 9 months inside Mary-- as a human tabernacle-- and spent another 30 years in her company. She was his first and best disciple. Her entire role is leading people to Christ… but how could she herself accomplish this task if she herself was not perfectly united to him in every way?
Obviously, Judas is one example of someone who, despite three years in Jesus’ company, still didn’t get it. The priests and scribes are an example of someone who never recognized Jesus for what he was, despite coexisting with him. Jesus was definitely surrounded by the imperfection of the Apostles!
She’s had the title of Achrantos (spotless, all-pure) since, what, the 5th c? (aka the 400’s.) In the 300’s, she was referred to as Prokathartheisa (pre-purified). She gets equated with Eve before the fall and is always held up as an example of holiness.
On the other hand, you have some great medieval saints who had trouble with the concept as well. St. Bernard was, like, “How can there be absence of sin where there’s concupiscence?” and St. Thomas Aquinas was, like, “Well, I think Mary contracted original sin, but got cured before she was born.”
So there was definitely a lot of dialogue and debate as to what had happened. Eventually, it was generally agreed that being preserved from original sin did not remove her from needing Christ’s grace, but rather, she had been granted a more perfect form of redemption due to her special role in salvation history. People didn’t like to gainsay Aquinas and/or thereby get on the wrong socio-political side of the Dominicans, though, so it took a few more centuries before the dogma was defined.
All that said— I have some Orthodox friends who generally look upon it as going overboard. I don’t know whether that’s their personal belief, or whether it’s their doctrine in the absence of defining dogma.
So, yeah. It’s been something people have struggled to logic their way around for a centuries. Some people are okay with the concept of Mary’s redemption having happened in a better, more perfect way than pretty much everyone else in history, because she had a different role to play that no one else has ever duplicated. Other people have trouble getting past her humanity and the limits that they know naturally come along with it. But ultimately, neither my belief nor anyone else’s disbelief is going to change whatever God had chosen to do 2,000 years ago.
But if right now, all you have is love for her because Jesus loved her first-- that’s a good place to start.