Ok, first question: What do you think "sin" is?
Because theologically speaking, I define it as disobedience to God,and I don't see how disobedience can be genetic.
...and here's where things get dicey. What it comes down to is that God is not to be questioned - and that's just not going to work for me, as I find many of the actions attributed to Him to be highly questionable.
But you don't, and that's fine - I'm not going to stand between someone and their beliefs... so long as their beliefs don't harm me or mine.
Again, that's your belief, but keep in mind that I was quoting Christian doctrine.
Feel free to disagree... with them.
Again, Christian doctrine says that's because Mary was without sin.
As I said, I define "sin" as "disobedience to God."
As I'm on the fence about the existence of God, the issue of "sin" is moot.