Do Natural Laws and Systems come from God? // Why does Genesis depict Creation in Six Days?

Do natural laws and natural systems come from God also?

Yes. The laws of nature and natural systems are also part of God's creation.

Man is not a blank slate. He is shaped by the order and the natural laws that God has inscribed in his creation. A Christian does not simply do "whatever he wants". He knows that he harms himself and damages his environment when he denies natural laws, uses things in ways contrary to their intrinsic order, and tries to be wiser than God, who created them. It demands too much of a person when he tries to design himself from start to finish.

Why does the Book of Genesis depict creation as "the work of six days"?

The symbol of the work week, which is crowned by a day of rest (Gen 1:1-2:3), is an expression of how good, beautiful, and wisely ordered creation is.

From the symbolism of "the work of six days" we can derive important principles: (1) Nothing exists that was not called into being by the Creator. (2) Everything that exists is good in its own way. (3) Something that has become bad still has a good core. (4) Created beings and things are interrelated and interdependent. (5) Creation in its order and harmony reflects the surpassing goodness and beauty of God. (6) In creation there is an order of complexity: man is superior to an animal, an animal is superior to a plant, a plant is superior to inanimate matter. (7) Creation is heading for the great celebration when Christ will bring the world home and God will be everything to everyone. (YOUCAT questions 45-46)