Thanks for taking the time to present your thoughts.
You note two verses of Scripture as the foundation for your belief that Mary is outside human condemnation following the fall, ie., immaculately conceived, Gen.3:15 and Luke 1:28. Are there any other verses that are more definitive? Also, how can you reconcile this sinless state with her death. Aren't the wages of sin death?
The early Church Fathers refer to Mary under such titles as "all holy," "all pure," "most innocent," "a miracle of grace," "purer than the angels," "altogether without sin," and these within the first three centuries of the Church.
How do you know they got it right?
Obviously many of them didn't. They were dealing with heresies coming from all sides, and so some of them incorporated the female pagan rituals into these inflated descriptions of Mary.
Isis and Cybele became Mary.