If what you say were accurate, the perfect tense would have been used.
Actually, only the present tense will do what is being done here... The ongoing present - eg "I am not knowing a man..." - establishes an ongoing policy. The perfect would describe a prior decision and its consequences, and can be revised in the present... The aorist would simply describe a past decision... Both are subject to revision in the present... But the ongoing present is the ongoing decision to not be knowing a man... And this decision She has had from Her earliest beginnings, because from her earliest beginnings, She has been inwardly, and not outwardly, directed... It is this inward focus of Her person from the git-go of Her birth, which we all have but turn away from, but which she retained fully, that differentiates and elevates her to the New Eve... She is an awesome person, who lived an awesome life, who is still in the world in the Church that IS Her in a very mysterious way, for she is the GYNE, the Woman, through Whom Christ was pleased, as the New Adam, taking up where the Old Adam fell, to enter into the creation which He had created. This event in itself, His very entire presence within Her holy womb until birth, elevated her to a condition of being that we who do not and can not do such a thing, can only stand in awe of...
She is, in the Church, the Woman persecuted by the Dragon in Revelation...
I don't know a man and never will is your interpretation of events.
It is the meaning of the Greek present tense used in this context.
A betrothed woman SHOULD EXPECT children, do you not agree? As soon as the marriage is established, then conjugal relations begin, and children are the consequence...
Yet...
What does she say?
"How can this be?" [that I will bear a child]
And she does
not say: "Because I have not known a man."
Because that is expected - Marrying virgins was the norm...
But instead she says: "Because I AM NOT KNOWING a man..."
Now - If you want the REAL proof, I can offer you the "angel slap" defense of the EV...
Remember what happened to Zacharias when HE questioned the Angel?
And every OTHER poor spiritual slob who question a message from God?
It did NOT turn out all that well, did it?
But the Angel did NO SUCH THING to HER for Her question...
He simply gave Her answer as She had so simply asked...
There is a LOT of unpacking to do in this pericope...
Rather, it was the present tense.
How will I get pregnant since I don't know a man?
How can a betrothed woman about to get married say such an inane thing?
By normal virginal standards, she is about to get married and have kids...
Such a reply as you have her making is simply a non-sequitur...
Arsenios