Genesis 3:15 and the Virgin Birth

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If one is to make a link between Genesis 3:15 and the virgin birth several questions must first be asked, such as; why is the word "Zera" (seed) is masculine? And why does scripture in almost every instance seem to allude to word zera as being sperm from the man's line? Third and most importantly, why does the genealogy of BOTH Matthew and Luke refer to Joseph's line rather than Mary's? Even 2 Tim 2:8 alludes to the sperm (zera) of being from the Joseph's line whose genealogy traces back to King David.

II Tim 2:8 "Remember that Jesus Christ of the seed (zera) of David was raised from the dead according to my gospel"

John Keyser of “hope of Israel” website writes:

Genesis 3:15 is simply saying that from Eve's offspring (the HUMAN race, NOT some code word for Mary's egg) would arise one or possibly many (Messiah or the "Israel" of YEHOVAH God) that will crush the head of Satan. There is nothing mysterious or mystical at all about the clear and simple meaning of the verse. All mankind were offspring of Adam and Eve. The idea promoted by the virgin birth adherents, which is that Genesis 3:15 represents some mysterious "code" that negates ALL the subsequent prophecies showing that Messiah would be a descendant of King David through his father, is an outlandish assumption and is shown to be an unparalleled attempt at deception by traditional Christian leaders. Also, since Eve's offspring are HUMAN BEINGS, the "God in the flesh" teaching is further weakened since IF the Messiah is "God", he is NOT human, despite the blasphemous verbal gymnastics conducted by those that promote one can be both human and God. This particular misrepresentation of Scripture (Gen. 3:15) is one of those false doctrines for which we show little patience towards its promoters due to their intent to demolish the clear Scriptural context just so they can salvage a primary lie the great harlot hopes to promote.

The Scriptures VERY CLEARLY prove, in case after case after case, that one's genealogy is traced THROUGH THE FATHER. It is for this reason, for instance, that we read in Kings and Chronicles instances of where the sons of Kings were killed by wicked rulers in an attempt to prevent the seed of David from continuing on as kings of Judah, and where YEHOVAH God allowed the sons of various wicked men to be killed in order to destroy their seed (eliminate their future offspring). Obed, the Israeli grandfather of King David, had Ruth, a Moabite, as his mother. Similarly Rahab, the non-Israelite harlot, is an ancestor of the Messiah. However, since it is ALWAYS the father that determines one's Biblical heritage, the non-Israelite status of these women is meaningless.”