There it is...the prevarication of Roman Catholic apologetics. See the bold part above in your comments. Please show us the evidence of Protestant or Evangelical faiths denying the virginity of blessed Mary. Show us please. No one has denied on this thread the virginity of Mary 'until' or 'till' she gave birth to Jesus Christ.
That is the Scriptural evidence presented. There is no doubt from Scriptures Mary was a Virgin when she gave birth to Jesus Christ. NO ONE has argued against that, no one. The debate is AFTER she gave birth. There is no Scriptural evidence she remained a virgin---was a perpetual virgin. No evidence. There is evidence that she and Joseph lived a normal married life. It is all in the 'until' or 'till'.
The other prevarication we are seeing on this thread is to project to non RCs the notion that we or some of us deny the Deity of Jesus Christ because we do not adhere to the perpetual virginity of Mary. How that came about I don't know but it is obvious and dishonest.
In the same manner I could say a Roman Catholic relies on the Deity of Jesus Christ through Mary.
Which much relies on straw men, arguments from silence and creative extrapolations.
While the Holy Spirit is careful in characteristically recording notable exceptions to the norm, even of lesser characters, from great age (Methuselah), to excess size, fingers (Goliath), strength (Samson), devotion (Anna), diet (John the Baptist), to the supernatural transport of Phillip, the singleness of Paul and Barnabas, and uncharacteristic duplicity of Peter, long age and celibacy (Anna), absence of parents, sinlessness (of Christ is stated at least thrice), yet Marian lifelong sinlessness and virginity are not, but are read into the text based upon the fallacious idea of necessity, or possibility.