Okay but you were asking how God could have created evil. I'm still waiting for an example of evil that is God's doing and not humans.
Discussion
God created satan and adam. He knows their nature. He set up temptation for adam knowing that he would succumb and eat the fruit. Intentionally setting someone up for failure is evil. It's equivalent to giving car keys to a child and then saying it's not my fault that they got hurt trying to drive. It was their free will and lack of reasoning. That's neglect and child endangerment.
What does failure mean? What are the preconditions, and the mechanics, broadly speaking?
Failing to abide by the rule to not eat from the tree
That has a nonliteral meaning. Its as misunderstood as Revelations.
Broadly speaking. What's a goal you might fail or succeed at? What do you need to be able to succeed? What do you get by succeeding? Is success a thing if failure isn't possible?