"Your ignorance and disputation of the truth is a relatively recent exercise in the history of Christianity, Helvidius and a few others notwithstanding. The protestant "heroes" Luther, Calvin and Zwingli; often touted in the religion threads here as the ones who "got it right", amongst many others, categorically reject your attempt at revisionism. They all belived in and taught that the Blessed Virgin Mary gave birth to a single child, Jesus Christ, and remained a perpetual virgin."
Do you know how they explained Mark 6:3?
"Is he not the carpenter, 3 the son of Mary, and the brother of James and Joses and Judas and Simon? And are not his sisters here with us?" And they took offense at him."
Or Mathew 13:55 "Is not this the carpenter's son? is not his mother called Mary? and his brethren, James, and Joses, and Simon, and Judas?"
The concept of the virgin isn't because virginity is holy, but the fact Mary didn't have relations to get pregnant is the mystery.
I am not taking the Blessing from Mary, God did choose her to bear Jesus, but God also wanted Joseph and Mary to have normal lives afterwards. And the Books tell us they did.