The same sense of having "known" (yada/יָדַע) an individual group, person, or god is not merely a vague awareness of existence, but a relative form of intimacy.
https://biblehub.com/hebrew/strongs_3045.htm
In Exodus 6:3, Elohim says that as YHWH He had not been known to the Patriarchs.
https://biblehub.com/text/exodus/6-3.htm
The Patriarchs were aware, however, of the existence of a "god" named YHWH, at least as early as Genesis 4:26, long before Moses and YHWH "knew" each other.
https://biblehub.com/text/genesis/4-26.htm
This difference is further evinced in the knowledge of Israel by YHWH, Who, claims to not have "known" any other nation as of Amos 3:2. Obviously, YHWH is quoted often of being aware of other nations.
Not known: Exodus 6:3 HEB: נוֹדַ֖עְתִּי KJV: JEHOVAH was I not known to them.
Known: Amos 3:2 HEB: יָדַ֔עְתִּי KJV: You only have I known of all the families
In Genesis 3:7, Adam and Eve are said to have become "known" that they were naked. After this, they sew together leaves to cover themselves. This covering is more likely to have been a weaved blanket than loincloths. YHWH calls, and they hide from Him. The fruit of the Tree Of The Knowledge Of Good And Evil is considered the cause of the revelation of "knowing" their nakedness.
Until this point, YHWH had not commanded that His creation "be fruitful and multiply", and the very terminology used in being "fruitful" ought not be lost in translation.
YHWH then affords His people with tunics made of hide, and banishes them from the Garden Of Eden.
Adam "knows" Eve's nakedness again, and she is or becomes pregnant.
According to scripture: "Now the man knew Eve his wife conceived and gave Cain and said 'I have got a man from [or with] YHWH'".
https://biblehub.com/text/genesis/4-1.htm
The characteristics of Cain are similar to the Jealous God. It is also through the lineage of Cain that the Watchers, Nephilim, Giants, and Azazel are born.
Whether Abel was Adam's son is of little interest, since he has no progeny, and appears to live only to exemplify the contrasting differences of his brother. The Jealous God is graceless in refusing a gift from His firstborn, who then, in a fit of - you might have guessed it - ***jealous ***rage, kills his brother.
Seth is the first child that is obviously and unambiguously Adam's.
The divine influence from the breath of YHWH through Adam and Eve, and into Seth was less pronounced than the divine insemination of Cain's lineage.
YHWH is quoted as saying "not strive my Spirit man forever also he is flesh become his days hundred and twenty years", indicating that the life expectancy of the lineage of Seth would decline to as much as 120 years.