I would like to say something about dualism and opposites.
Black and white; hot and cold; day and night- these are opposites as the two sides of a coin are opposites. Three feet is not the opposite of four feet. GOD is good. What measures up to His standards is good. If it does not, it is evil.
We could very simply change terms, and call the side of the coin that bears the face tails, and call the other side heads. People would adapt and nothing would really change. Because GOD defines good by His character, we cannot trade definitions, If we did, then murder, theft, and rape would be good- socially acceptable. And feeding the hungry, treating and teaching your children well, stopping at red lights would be evil, and punishable by the courts.
And like two chess pieces of opposing players, often good and evil stand very close together. One may consider them opposites, but they are not interchangeable as many things that we consider opposites are.
And Bean, I did not start this out as a refutation of your stance, but it turns out that it is. GOD is good, and before He created space and time, and man, good existed in the absence of evil.
JayR