I don't even know what you're/we're arguing at this point. Christianity is not the source of morality. There were literal ages of human tradition before it. Cain and Abel didn't exist. I already addressed the idea of God creating us.
Those things being "evil" did NOT originate with that tradition. People had thought of killing or stealing from their neighbor as bad for literally hundreds of thousands of years before your Abrahamic God.
Yes those things did exist beforehand. I’m giving you the earliest record of it with Cain as well as how it broke the same law reiterated throughout the Pentateuch. Youre simply dismissing it because you don’t like the source material.
What authority deemed murder a bad thing in these ancient societies you speak of? They just decided it one day on their own? If it’s just a “trust me bro” then that takes more faith to believe imo than centuries old universally accepted transcripts.