Garden of Eden
According to the biblical book of Genesis, God created the Garden of Eden as a dwelling place for the first two humans, Adam and Eve. The garden was a paradise of plenty where Adam and Eve would never suffer illness or death. Unfortunately, Adam and Eve defied the will of God by eating the forbidden fruit at the center of the garden, and God cast them out of the garden so that they would no longer live forever. According to Genesis, a cherub with a flaming sword then guarded the Garden of Eden to prevent humans from returning.
Adam and Eve initially had two children, Cain and Abel. After Cain killed Abel, and was cursed to wander, Adam and Eve conceived another child named Seth. The sons are explicitly named in Genesis, although it does state that there were other sons and daughters as well (Genesis 5:4).
According to the Bible all humans on Earth are descendants of Adam and Eve. Their children Cain and Seth create two separate lineages of human life on Earth. Cain and Seth must have had sexual intercourse with their mother Eve, or an unnamed sister to propagate humanity. This was not necessarily considered immoral because there was no other way to create children.
Generations of Adam
The generations of Adam are the two lines of descent from Adam, both ending in the name Lamech, which are given in Genesis. One line goes from Adam's son Cain, and the other goes via a son of Adam named Seth. The lines are:
Cain
Seth
Other Views
As with many passages in Genesis, there is debate among Christians whether or not the story of the Garden of Eden should be taken literally or metaphorically. If literally, there is also debate over how long ago Adam and Eve were banished from paradise.
The Israelite word for Eden is Aten, which is very similar to the Egyptian word "Atlen" which means "Atlantis". Atlantis is also believed to be the origin of mankind.