So untrue, please do some research before posting false information like this
http://knol.google.com/k/genealogy-of-adam-and-eve-according-to-the-bible#
“And Cain went out from the presence of the LORD, and dwelt in
the land of Nod, on the east of Eden. And Cain knew his wife;
and she conceived, and bare Enoch: and he builded a city, and
called the name of the city, after the name of his son, Enoch.” (Genesis 4:17)
“And the days of Adam after he had begotten Seth were eight
hundred years: and he begat sons and daughters:” (Genesis 5:4)
