The theory of Cain is a possibility and this is why. Cain is claimed to be the first born son of Adam and Eve. Cain killed his brother Able in a jealous rage and was thus banished and given a mark.Genesis 4:10-15
10. What hast thou done? The voice of thy brother's blood crith unto me from the ground. 11. And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand; 12. When thou tillest the ground, it shall not henceforth yield unto thee her strength; a fugitive and a vagabond shalt thou be in the earth. 15. And the LORD said unto him, Therefore whosoever slayeth Cain, vengeance shall be taken on him seven fold. And the LORD set a mark on Cain, lest any finding him shall kill him.
According to vampire legend, Cain wondered until he found Lilith (Adams supposed first wife) by the Red Sea. Lilith showed him the power of blood which may be considered to be the tree of life. It is said that this is why the Jewish drain all blood from their meat before cooking and eating it. From this union between Cain and Lilith came forth a host of demons and vampires in myths across the globe. Cain is said to have had legitimate children with an unnamed woman. Some of his children are regarded for inventing the harp and metal working. However, Cain’s children are almost erased from further mention in the Bible past Genesis 4:26. Cain is referred to only twice more after in the New Testament as the prototype of wicked man. Cain is then what seems to be stricken from the good book. Lilith appears only in Jewish apocrypha texts, not mentioned in the Bible or the Torah. Cain and Lilith’s spawn may be read in the epic poem Beowulf.Beowulf
Till the monster stirred, that demon, that fiend, Grendel, who haunted the moors, the wild Marshes, and made his home in a hell Not hell but earth. He was spawned in that slime, Conceived by a pair of those monsters born Of Cain, murderous creatures banished By God, punished forever for the crime Of Abel's death. The Almighty drove Those demons out, and their exile was bitter, Shut away from men; they split Into a thousand forms of evil-- spirits And fiends, goblins, monsters, giants, A brood forever opposing the Lord's Will, and again and again defeated. (Ll. 101-114)...Cain had killed his only Brother, slain his father's son With an angry sword, God drove him off, Outlawed him to the dry and barren desert, And branded him with a murder's mark. And he bore A race of fiends accursed like their father... (Ll. 1261-1266)
Cain is said to be a sinner but in the Bible Cain is said to build the city of Enoch and his descendents become great inventors. For some reason the Author of Beowulf speaks horribly about Cain while the Bible speaks of him as a great sinner and then just doesn’t speak of him anymore. It is also said that Grendel’s ancestors were driven out of Eden and Cain and Lilith were the only two driven out by God. “The Almighty drove those demons out.” The only other mention of sin in Eden is when Lilith is mentioned. Lilith said the holy name of God and was thence forth banished from Eden forever. In Jewish mythology she is said to be the mother of demons. This is one theory to the origin of vampires.
Some theories claim that the original vampire might be Judas Iscariot who is the betrayer of Jesus Christ. Because Judas betrayed Jesus to the Romans, he and his family were cursed for this evil deed. The Bible states that Judas committed suicide because of his guilt. Vampire folklore claims that those who commit suicide are doomed to come back as vampires. Judas is told to have had red hair and this was the identifying trait of his descendents. The Greeks are told to have thought that all who had red hair were vampires. It is also said that vampires may detest silver for this reason also. Judas betrayed Jesus for 30 pieces of silver. Judas tried to return the silver but couldn’t so he threw it away in disgust.Matthew 27:3-5
3. Then Judas, which had betrayed him, when he saw that he was condemned, repented himself, and brought again the thirty pieces of silver to the chief priests and elders, 4. Saying, I have sinned in that I have betrayed the innocent blood. And they said, What is that to us? See thou to that. 5. And he cast down the pieces of silver in the temple, and departed, and went and hanged himself.