The Perpetual Virginity of Mary and the Supernatural Birth of Jesus: Roman Catholic Doctrine

What most people do not understand about the Roman Catholic doctrine of Mary's perpetual virginity is that they also teach that Jesus was born supernaturally and not naturally so that Mary's virginity would remain intact after childbirth. Needless to say this smacks of gnosticism and undermines the true humanity of Jesus. The following quote is not from an official Roman Catholic link but is Roman Catholic nevertheless and shows that I am not making this up:

The significance of Mary’s virginity during birth is understood when we ponder the whole incarnational and sacramental economy: in Jesus, God who is Spirit, is united with our human flesh. There is no dualism between matter and spirit in Catholicism; rather, the physical manifests the spiritual. Jesus as a visible human being manifests the invisible God. In continuity with this sacramental logic, Mary’s virginity during child birth, through the miraculous passage of the baby Jesus through the womb of Mary, without violating her integrity [which is parallel to His passage from the tomb through the stone without breaking the sealed grave], manifests the virginity of her heart which was given to God alone. [From: Perpetual Virginity of Our Lady].

Another proof for this comes from the New Advent website, which is Roman Catholic as well:

* . . . that the supernatural influence of the Holy Ghost extended to the birth of Jesus Christ, not merely preserving Mary's integrity, but also causing Christ's birth or external generation to reflect his eternal birth from the Father in this, that "the Light from Light" proceeded from his mother's womb as a light shed on the world; that the "power of the Most High" passed through the barriers of nature without injuring them; that "the body of the Word" formed by the Holy Ghost penetrated another body after the manner of spirits. [The Virgin Birth in Catholic Theology].