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A common claim is that OT God would incorporate good and evil where as NT God is wholly good.
However OT God created things, and all those things were declared to be good. Evil comes from going against the creation and thus God and is merely tolerated for educational reasons
Evil is whats wrong in Gods eyes. God gave us free will, and free will requires the abillity to choose wrong, or else we would not be able to choose at all. If choosing wrong is evil then there cant be free will without evil
God creates Humans in his image, and he loves every one of them that is and will be. Satan, being basically a spoiled Child doesnt like us getting our fathers attention and thus tries to show him how lowly we are by corrupting us. He does this by bringing the fruit of knowledge of good and evil to us, which while likely intended for us eventually, we werent ready to eat yet as we were basically little babies in adult bodies.
With the fruit now Eaten we had to learn of both, Good and Evil. We knew good from our father and from being in Eden, but what was missing is Evil.
The best way to learn is to experience, thus we have to experience evil to learn of it, and we couldnt have evil in Paradise thus were send out, possibly falling from a spiritual state of existence into this mortal and material state. This world is sandbox/a tutorial so to speak. A containment reality where we can fuck around without being able to fuck up cosmically. Here we are meant to experience Evil, and Satan trying to corrupt us still is doing so by unleashing every plague he has up his sleeve onto us that we may fall from faith while simultaniously subverting what good and evil is. God loving and trusting us lets this happen since its the best way to learn of evil for us in the first place, and because he knows we will still praise God after everything. This is essentially the story of Job on a global scale.
Basically we are meant to learn good choices, and what this good actually is