Agnostic of Christian cultural background here: I think part of what is meant is that murder was caused by original sin. Sure, death from other causes would already have occurred in any case, but murder is still part of our world because we evolved as K-strategists in desperate competition with other members of our species; that original sin that we are struggling to leave behind, had to be the case because such competition is what drove us to evolve intelligence in the first place.
As for creation myths, we have a document written several thousand years ago which says the universe began in a flash of light and developed through several stages of increasing complexity, which I think is pretty impressive given that it wasn't until the mid-20th-century that science established this is indeed the case.
"As for creation myths, we have a document written several thousand years ago which says the universe began in a flash of light and developed through several stages of increasing complexity"
Stages are named as days, and the "omnipotent" god even gets tired and has to rest (!) the whole day after 6 in which he makes the whole word, including the "firmament" to keep the water on the heaven from not raining down all the time.
The use of the English word 'days' is effectively a mistranslation. As for the seventh day, that's a context switch for some life advice: after work must come rest, trying to work a seven-day week is stupid and harmful - something quite a few people nowadays would do well to remember.
And God called the firmament Heaven. And there was evening and there was morning, a second day." (Genesis 1:8)
Which word of those is mistranslated?
Note that because of this and similar lines the Jews count the days for celebration (including Shabbat) to have a beginning at the evening (Shabbat starts on Friday evening).
If you mean "yō·wm" here are all the places where the word was used in the Bible:
It's the almighty that had to rest, not the people. The absurdity is obvious for everybody except the believers. But that is the definition of faith, believe, no matter what.
As for creation myths, we have a document written several thousand years ago which says the universe began in a flash of light and developed through several stages of increasing complexity, which I think is pretty impressive given that it wasn't until the mid-20th-century that science established this is indeed the case.