Elohim had blessed the human beings He had created and allowed them to have children. That way A'dham became the father "of a son" in his own likeness, "after" his own image. We were not told this about Cain and Abel simply because the text did not wish to discuss them at length. In this chapter 5 Moses goes straight to the third son of Adam, Enosh. It is noted that from that time the people started to call upon the Name of Jehovah God.
The fifth chapter of the first book of the Pentateuch brings us the accounting of mankind. Moses gives an idea how the Children of God came one after the other on earth to play their role in history.
The Word of God tells us how the first living souls became tricked by their own wrong thoughts and fell for the pleasing of their eyes and by their disobedience to God got punishments over them and got being banished from the Garden of Eden.
When listening to certain Christians we only can have the impression they do not understand the Hebrew way of talking and do not see how often idioms, parables and allegory are used. Too often they take words as names and texts literally when they are not meant as such.
After having looked at Adam we cannot pass his helper Eve. It was she who brought the man to follow her idea and to ignore God's Wish not to eat from the Tree of moral, with as consequence that they got knowledge of good and evil and came to learn pain and death.
In this 4th part looking at the way we should see at the accounts of the Genesis we see how words can be taken in their grammatical sense, and how some things are to be seen not in the literal sense.
In the second chapter of the Bereshith light is shed on the day that יהוה Elohim made earth and heavens and created a beautiful Royal Garden where man, made in the image of God, could live in peace, with the animals, to which he receives rulership (not ownership over the earth).
The Bible opens with the story of the beginning of everything, presenting the six periods of development (six days of creation) and the final period of establishment or rest.
Worldly books in no way can give such a clear picture to man what caused everything to come into being and how there may be a solution to the wrong steps taken by the first human beings. For this, man needs to understand clearly what caused this troublesome world. The Bereshith tells the story of the origin of life and death.