The best thing to shoot that pathetic argument down is that Adam and Eve weren't BORN at all.
I was referring to the “Immaculate Conception” of Mary.
Adam and Eve were created "innocent" which is a whole lot different than "sinless". They certainly proved soon enough that they were more than capable of sinning. By their sin, the rest of creation was under the consequence of sin and ALL humanity inherited the "sin nature". Jesus, because he is God, was truly the only human who was sinless - born sinless and remained sinless. He was conceived within the virgin - meaning he had no human father and did not inherit the sin nature. Mary was born as a normal human being to two parents who were born as normal humans and they were ALL under the consequence of the sin nature. Catholics and others call this "original sin", but, in reality, it is the sin nature we all inherit from our first parents.
And just like Adam and Eve, we may be innocent as little babies but it doesn't take very long before our tiny little sin natures introduce themselves to the rest of the world. Before we even knew what sin was, we were sinning. It is not disrespectful of Mary to admit she was a sinner, because she is human and God says ALL have sinned and fall short of the glory of God. It is simply being true to what the Bible says, and that takes priority over what people think and develop with their traditions. If others want to believe that Mary did not have a sin nature or she didn't need a savior like we all do, they can go right ahead. It's when religious leaders usurp what Scripture says and mandate belief in their traditions in order to be saved that we will have problems.