Another straw man argument.
I do not accept your premise. Can you deny the premise in mine? There are obvious exceptions to yours, besides the fact that you had to insert “to normal human parents” where it does not exist in scripture. Infants, those who never obtain mental capacity to comprehend sin, etc. Some people never sin, therefore the scripture “all have sinned” is either incorrect or figurative...pick one.
Explain your objections to ‘Mary is the mother of Jesus’. If you accept this premise, you must logically accept what follows. Unless, of course, you don’t believe Jesus is God. That is what makes logic logical.
Love,
O2
Then the jury awaits your explanation of what is wrong with it...
All humans; born of normal human parents; are sinners. Mary was born of normal human parents. Therefore; she was a sinner.
WHY 'must' I?
Because YOU have been taught it?
Hail Mary; Mother of Jesus; pray for us sinners...
I'm sure that YOU have no objection to say this, instead of an unbiblical phrase you've been taught.