I do not see where God created the world "perfect". I do believe Adam and Eve were perfectly made "in His image", probably heartier and stronger, bigger maybe? But if they were created as "perfect beings" then, they would not have sinned. I can see God, giving them free will, with the ability TO sin. And, of course, God knew they would sin. He want's His children to choose to Love Him. It could also be that the Glory of God's love and grace could not be realized unless Adam and Eve did sin. Or, maybe it is a combination?
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