A lot of the early books come from a time before the church decided to make Abrahamic religions monotheistic. YHWH was once the Hebrew god of war; a god within a pantheon of others. In that context, it makes sense that the other gods would have been doing their own thing. Another good example is GEN 3:22.
Don't know wasn't there but Genesis 4 definitly speaks about other people because Cain has a wife and his sons married some women who were not mentioned before.
It isn't explained. They were there when Adam and Eve were expelled. Which means they were kinda like an experiment for God.
But God is all-knowing, he basically set a trap on them knowing the outcome. He knew he was going to punish humanity even before he created the universe.
"Jusr wait until I create these mofos, the ass whooping I'm gonna give them... Fucking hell, I love working in mysterious ways"
I asked my Catechism teacher and she said
“they did have sisters, they just weren’t documented because nobody cared back then” (misogyny in the Bible, who could have guessed?)
“the inbreeding is why we’re no longer the image of God” (well damn) and
“we didn’t have diversity before the Tower of Babel” (oh no, if only we didn’t dare challenge God, we could have prevented all those pesky different languages and cultures).
Can you just admit that the Bible is full of nonsense rather than justifying it with downright batshit reasoning?