(I dont remember the exact to qoute so corecct me if im wrong.)
In the bible cain kills abel and gets banished. God gives him a mark so that no other humans can kill him.
What other humans? Adam and eve gave birth to cain and abel and other than that there were no other humans right?
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Not Christian, but in the Bible Adam and Eve supposedly had tons of children. One that I'm certain of is Seth, because he's listed as a son of Adam in the genealogy of Jesus.