Here is my take on good and evil.
So, being creations of God, angels and men are hardwired to do good and follow the will of God, this is because all of God's creation were good in the beginning. But God gave us free will, the freedom to do good or evil.
Good and evil are just consequences of free will operating under laws or commandments, so good and evil are inherent to free will.
But then, who ultimately determines which is good and evil? In Judeo-Christian world, only God, His will and commandments (laws) are absolute and universal. Therefore whoever follows and adheres to His will and commandments (laws) is doing "good", and whoever transgresses them is doing "bad or evil".
If there are no commandments (laws), how do we determine which is good or evil? We cannot! There is no good or evil if there are no commandments (laws).
So, if there is no God, then there are no commandments (laws), if there are no commandments (laws), then there is no good or evil, a version of the world which the author of this thread and the rest of the atheists in the world can be happy with.
But then, there is GOD! And the authority over the material and the spiritual world is all His, and to that I say Amen.