Adam and Eve by the help of the Lord [Yahweh] had Cain and Abel. Abel brought an offering of sheep, and Cain brought a grain offering, but the Lord only had regard for Abel’s. Cain became angry and killed Abel in the field and lied to the Lord about it. Cain would now be a fugitive and wander the earth and the land would not bear fruit for him. God promised to keep anyone from killing Cain, and he had children. 5 generations later, Lamech would be a murderer and God-hater as well. Adam and Eve had another son, Seth, and his line began to call upon the name of the Lord [Yahweh].
The sinless beauty of Paradise is lost, and the ugliness of sin spreads, but God has not abandoned His promise. He gives a child and people again began to call upon/proclaim the name of Yahweh.