Neal--
"I am still floored that it is thought by Catholics (is it official dogma?) that Mary remained a virgin." Yes it is official dogma.
Martin Luther thought so--
Christ . . . was the only Son of Mary, and the Virgin Mary bore no children besides Him . . . "brothers" really means "cousins" here, for Holy Writ and the Jews always call cousins brothers. (Sermons on John, chapters 1-4, 1537-39).
He, Christ, our Savior, was the real and natural fruit of Mary's virginal womb . . . This was without the cooperation of a man, and she remained a virgin after that. (Ibid.)
Athanasius thought the same--
"Let those, therefore, who deny that the Son is by nature from the Father and proper to his essence deny also that he took true human flesh from the ever-virgin Mary" (Discourses Against the Arians 2:70 [A.D. 360]).
Jerome thought as much--
"[Helvidius] produces Tertullian as a witness [to his view] and quotes Victorinus, bishop of Petavium. Of Tertullian, I say no more than that he did not belong to the Church. But as regards Victorinus, I assert what has already been proven from the gospel—that he [Victorinus] spoke of the brethren of the Lord not as being sons of Mary but brethren in the sense I have explained, that is to say, brethren in point of kinship, not by nature. [By discussing such things we] are . . . following the tiny streams of opinion. Might I not array against you the whole series of ancient writers? Ignatius, Polycarp, Irenaeus, Justin Martyr, and many other apostolic and eloquent men, who against [the heretics] Ebion, Theodotus of Byzantium, and Valentinus, held these same views and wrote volumes replete with wisdom. If you had ever read what they wrote, you would be a wiser man" (Against Helvidius: The Perpetual Virginity of Mary 19 [A.D. 383]).
Augustine thought the same---
"Heretics called Antidicomarites are those who contradict the perpetual virginity of Mary and affirm that after Christ was born she was joined as one with her husband" (Heresies 56 [A.D. 428]).
Calvin--
"There have been certian folk who have wished to suggest from this passage (Mt 1:25) that the Virgin Mary had other children than the Son of God, and that Joseph had then dwelt with her later; but what folly this is!" Sermon on MT 1:22-25 published 1562
Zwingli--
"I firmly believe that Mary, according to the words of the gospel as a pure Virgin brought forth for us the Son of God and in childbirth and after childbirth forever remained a pure, intact Virgin." Zwingli Opera v.1 p 424.
Neal, BTW did you ever get that box I sent you a month or so ago?
Dan