The God of the Bible is perfect in a completely different sense than Adam was before he sinned.
But, Adam was made in God's image. Let's do a little premise, conclusion type argument, and you tell me where it goes wrong.
1) God is perfect.
2) Adam is made in God's image.
3) Adam is perfect.
4) Therefore, Adam is perfect in the same way God is perfect.
As an example. If you have a perfect square, you make another square in that square's image and it is also perfect. Then wouldn't they be perfect in the same way? If one's perfection is different form the other's, then one wasn't made in the image of the other, something was changed.