So in their minds you are in error.
The Perpetual Virginity of Mary - Brothers and Sisters of Christ?
Virgin Birth—or Prophetic Slip?
The Perpetual Virginity of Blessed Mary
Aeiparthenos (An Anglo-Catholic Priest on Mary's Perpetual Virginity)
[Why I Am Catholic]: Because of the Protestant Reformers Beliefs On Mary
Catholic Biblical Apologetics: Mary: Virgin and Ever Virgin
Luther, Calvin, and Other Early Protestants on the Perpetual Virginity of Mary
Luther, Calvin, and Other Early Protestants on the Perpetual Virginity of Mary
The Protestant Reformers on the Virgin Mary
Zwingli’s’ Mariology: On Mary “Full of Grace”