Today we read John 3, the new birth chapter; you must be born again (literally: from above), the new birth is necessary to enter into the Kingdom of God; John 3:16 is the most quoted verse in all the Bible.
Genesis 4 tells of the results of original sin with the story of Cain and Abel and the beginning of animal sacrifice. After the fall people had the spiritual void not being able to fellowship with God, nor even communicate. To satisfy the need to do what they felt God wanted, and God showed that only sacrifice involving the shedding of blood would suffice
Genesis 5 gives the Genealogy from Adam to Noah.
The take home for today is there are two births, the physical birth and the spiritual birth (the birth from above), the first sacrifice, the first murder, the first man (Enoch) to be carried directly to God rather than die, (because he walked with God).