Is the knowledge if good and evil...evil?

After Adam and Eve bit the apple, He turns to His trinity and says, "Now they are like us, knowing the difference between good and evil."

I've always wondered why sin is defined in this way.

Why does the knowledge of good and evil make us sinners, but not God?

Maybe it's because we confuse our definitions of good and evil. Like we keep eating bad apples, over and over sick to our stomachs, because somewhere deep in our bellies we believe they are good for us. The same words God used for creation, we use for the perversion of it. Good.

But God's definitions of good and evil are never mixed up. Could you imagine being able to interact with everything as it really is? No illusions, no false hope, no dried up cisterns. God has pure reality pouring in and through him. In The Great Divorce, C.S. Lewis describes heaven as a place so solid that our human souls look like ghosts in comparison. A blade of grass is heavier than a tree on earth. As we grow closer to God, we become more solid. He teaches us how to separate light and darkness, so that someday, like Him, we will be solid enough to know good and evil, and not be overcome by it.