You're putting far too much emphasis on Mary here. Yes, she had Jesus in her womb, but that doesn't mean her womb was something special. Jesus was special - he needed no special "container".
Do you believe Jesus ever urinated or pooped?
It's an
opinion, not a doctrine. There is biblical support for God's creation and there is biblical support for Real Presence. However, the bible is very vague on Mary's virginity. When you read too much into what little there is, that's when you start falling into where you're at now.
I don't really care what Sasse believed. I don't really care what the ECFs believed. I know, horrors, but I kinda go based on what the bible says. There was no reason for her to remain a virgin. NONE.
I can pull far more scriptures that support marriage to your one little verse where Paul explains why it's better to not be married. Sure, my husband could probably focus better on his ministry if he wasn't married and didn't have kids, but his life is far richer for being married.
You also pull a few sentences from the Apology, but then you ignore what the rest of it says. How about these sentences, from the same section you speak of:
And nevertheless, just as an orator is not more righteous before God because of his eloquence than an architect because of his skill in architecture, so a virgin does not merit justification by virginity more than a married person merits it by conjugal duties, but each one ought faithfully to serve in his own gift, and to believe that for Christ's sake he receives the remission of sins and by faith is accounted righteous before God.
and
These testimonies teach that marriage is a lawful [a holy and Christian] thing. If therefore purity signifies that which is allowed and approved before God, marriages are pure, because they have been approved by the Word of God. [34] And Paul says of lawful things, Titus 1, 15: Unto the pure all things are pure, i.e., to those who believe in Christ and are righteous by faith. Therefore, as virginity is impure in the godless, so in the godly marriage is pure on account of the Word of God and faith.
I think perhaps you may have misunderstood the entire purpose of that section. I am certainly not in disagreement with scripture, nor the Apology. I am in disagreement with you and your specific interpretation.