Well, I would say that this does veer a bit from what was written concerning contradiction. Something may not be in the Bible, which may be a compelling reason for some not to accept it, but that is still not quite the same as saying it is actually contradicted there.
But that does now answer the fundamental question. And as it usually takes me hours (and energy) to type such long replies as you are responding to, due to my arthritic fingers (though i often do it by God's grace for the benefit of all), then rather than engaging in more debate with you over what Scripture says or warrants, and seeing as you said " Personally, I would never try to convince anyone of the doctrine of the Perpetual Virginity of Mary," then i think the fundamental question as to the basis for your assurance of Truth, and this doctrine, is what is most relevant.
And i think the issue for both sides has been fairly well laid out and little more needs to be said.
Well, I certainly can understand how painful hands would deter typing. You have my sincere sympathies on that.