Actually, your statement isn’t correct either.
There are 4 major doctrines surrounding Mary. 3 of them hold together, one does not.
Perpetual Virginity.
Assumption of Mary
Sinlessness of Mary
Immaculate conception of Mary.
Her perpetual virginity is the odd man out. It stands by itself. The other three all rely on one another.
Immaculate conception - Spared from original sin at conception.
Sinlessness - Mary as the 2nd Eve.
Assumption - Assumed, “wages sin are death, sinlessness, no death”
You assume those are necessary. I don’t (with the exception of the immaculate conception, which the bible clearly teaches).
I’ll go over your list.
You said:
Immaculate conception - Spared from original sin at conception.
That is not at all how I interpret it’s importance. For me, immaculate conception is part of the truth that God is the father of Jesus flesh. That is how he can be fully God (His father is God) and fully human (His mother is human)
Sinlessness - Mary as the 2nd Eve.
That is perverse. Eve was not Adam’s mother. Sin did not enter the world through Adam and Eve. It entered the world through one man, Adam. That is what scripture clearly teaches. I have no need for a second eve.
Assumption - Assumed, “wages sin are death, sinlessness, no death”
Like me, Mary has the option to accept Jesus as her personal savior and invoke the grace that the bible so often talks about. And that grace is made possible by Jesus’ perfect life, death and resurrection. Whether or not Mary died in her sins or saved by the blood of Christ is very important to her. It is completely irrelevant to me, regarding my relationship with Christ.