With no disrespect to the mother of God, the myth of Immaculate Conception only came about when St. Augustine sexualized original sin by misunderstanding the Eden myth, which talked about blame more than disobedience. He also was likley badly chatechized on the origins of the Book of Genesis. His work was to support a platonic sexual ideal that haunts us to this day. If original sin is blame and not disobedience (there were no "first parents" who went from Bushmen to some golden age of human perfection), the doctrine is not necessary. Platonic sexuality is not necessary, indeed, it arises from the take over of the Church by people who would now be called Asexuals. Not holy, just different. This also kills the necessary claims to that ideology that Simon, Jude and Salome were not Mary's other children or that Jesus was not married to Mary Magdalene and prior to his ministry, the rabbi of Capernaum. Assuming his asexuality was wishful thinking by Aces.