“Then God said, “Let there be light”; and there was light. God saw that the light was good; and God separated the light from the darkness” Gen. 1:3-4

God saw the light He made was good, and then He separated it from the darkness.  He never says the darkness is good, only the light.  There is no mention of the darkness being created here, only separated from the light. However in Isaiah 45:7, the creation of darkness is mentioned:

“The One forming light and creating darkness,
Causing well-being and creating calamity;
I am the LORD who does all these.”

The Hebrew word for light (“owr“) and the word for darkness (“chosek“) are the same between Isaiah 45 and Genesis 1.

It is passages like this that force us to question how we think we understand the scriptures.  In this case, we must consider that:

A) Perhaps other things were created in Genesis 1 that were not specifically mentioned, (such as the darkness); or

B) Is it speaking of the same type of darkness, even though the same original word was used?

Further, if it is not actual darkness we are dealing with in Isaiah, but instead calamity as the verse suggests – then we may be dealing with allegory here, unless, of course, calamity was what was meant in Genesis 1:4.  In the end, we may wonder if we are speaking of physical creation, or something more.