Why are you presuming that is threatening to anyone? Seems like a bit of projection going on there.
Maybe we should ask why the thought that Mary had sin is so threatening to Catholics?
We object to the teaching because it is untrue that Mary was without sin. There is not one shred of Scriptural support for the immaculate conception. It's really nothing more than romanticized wishful thinking.
So following Catholic reasoning, if it was not OK for Jesus to be born of a sinful woman, what makes it OK for Mary to be born of a sinful woman? Didn't SHE deserve better? After all, Catholics insist on calling her *queen of heaven* and claim that God is subservient to her in not being able to deny her any request.
I just realized that you had joined the conversation. Generally your comments are more personal attacks than respectful discussions so I decline to engage in any conversations with you.