I believe this song is a reference to the Bible. Cain and Abel were Adam and Eve's first two sons. Cain was jealous of Abel, so he killed him. God was pretty pissed at Cain, so he banished him, and put a mark on his forehead so no one would kill him.
I believe this song is a reference to the Bible. Cain and Abel were Adam and Eve's first two sons. Cain was jealous of Abel, so he killed him. God was pretty pissed at Cain, so he banished him, and put a mark on his forehead so no one would kill him.