Of the concept of Mary’s perpetual virginity, the genealogy and prophecies of Christ, and the conception and birth of the Son of God:
Consider Matthew Chapter 1. In the first verse the genealogy of Christ is attributed to David, “The book of the generation of Jesus Christ, the son of David, the son of Abraham.” What follows (Matthew 1:2-16) is actually the genealogy of Joseph-- even as verse 16 points out, “And Jacob begat Joseph the husband of Mary, of whom was born Jesus, who is called Christ.” In verse 18 we learn that Mary, while a virgin, conceives Christ ‘of the Holy Ghost’, “Now the birth of Jesus Christ was on this wise: When as his mother Mary was espoused to Joseph, before they came together, she was found with child of the Holy Ghost.” Verse 19 shows that Joseph, although considerate of Mary and Christ, had initially decided against marrying her, “Then Joseph her husband, being a just man, and not willing to make her a publick example, was minded to put her away privily.” Verses 20 & 21 indicate that Joseph was not necessarily always completely aware that Mary was pregnant with the Christ as an angel was sent to him in a dream, “But while he thought on these things, behold, the angel of the Lord appeared unto him in a dream, saying, Joseph, thou son of David, fear not to take unto thee Mary thy wife: for that which is conceived in her is of the Holy Ghost. And she shall bring forth a son, and thou shalt call his name JESUS: for he shall save his people from their sins.” Verses 22 & 23 reference the Old Testament book of Isaiah to indicate the fulfillment of prophecy inherent in Christ’s conception and Mary’s pregnancy, “Now all this was done, that it might be fulfilled which was spoken of the Lord by the prophet, saying, Behold, a virgin shall be with child, and shall bring forth a son, and they shall call his name Emmanuel, which being interpreted is, God with us.” (From what I understand this is an excerpt of Isaiah 7:14 which is part of a revelation that Isaiah was relating to the then king of Judah, Achaz, whom also is an ancestor of Joseph. However, the excerpt is followed by a dietary and time requirement that would seem to disqualify it from pertaining to the Christ, “Therefore the Lord himself shall give you a sign; Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel. Butter and honey shall he eat, that he may know to refuse the evil, and choose the good. For before the child shall know to refuse the evil, and choose the good, the land that thou abhorrest shall be forsaken of both her kings.-- Isaiah 7:14-16” Also, another pertinent excerpt may be Isaiah 9:6-7, “For unto us a child is born, unto us a son is given: and the government shall be upon his shoulder: and his name shall be called Wonderful, Counseller, The mighty God, The everlasting Father, The Prince of Peace. Of the increase of his government and peace there shall be no end, upon the throne of David, and upon his kingdom, to order it, and to establish it with judgment and with justice from henceforth even for ever. The zeal of the LORD of hosts will perform this.”)
Finally, in verses 24 & 25 Of Matthew chapter 1 Joseph is depicted as awaking from his dream, taking Mary as wife, and abstaining from sexual relations with her “till” Christ is born (and presumably for, at least, the purification period required in the Old Testament for post-partum uncleanliness), “Then Joseph being raised from sleep did as the angel of the Lord had bidden him, and took unto him his wife: And knew her not till she had brought forth her firstborn son: and he called his name JESUS.” Take note also of the words, “her firstborn son,” as these words may indicate or infer that there may be other sons and/or children.
Afterword:
I have found the Gospel of Matthew helpful in other situations such as the claim that there is not an eternal punishment. Matthew 25:31-46 appears to disprove the notion that, according to Christ, there is no punishment greater than death. This is, in my opinion, a great issue, and one for which I have found no scriptural grounds for the resulting variance in some secular Christian doctrines.
Scriptural quotes are taken from the King James Version of the Holy Bible
Disclaimer:
I am not hereby intending to replace the authority of the Pope, malign the tenets of Catholicism, vitiate the glory of Mary, or justify Protestantism. However, it is my intention to provide scriptural insight for reflection.