27 So God created man in His own image; in the image of God He created him; male and female He created them.
28 Then God blessed them, and God said to them, "Be fruitful and multiply; fill the earth and subdue it; have dominion over the fish of the sea, over the birds of the air, and over every living thing that moves on the earth."
In these verses, Moses was showing the Israelites the dignity, responsibility and the privilege of man. Man was created in the image and likeness of God and was given authority over all the creatures on the earth.
Back in Egypt, instead of ruling over these creatures, the Egyptians prostrated and worshiped them. They worshiped birds, creeping things and cattle in Egypt. Sin has a way of reversing God's decreed order.
Moses is supporting the first and second commandment of the Decalogue here. Man is not to worship these creatures. He is not to have other gods. He is also not to make images and representations of God out from these creatures. They can never represent God.
The closest thing that can represent God on the earth is man himself. But he himself is a creature of God and therefore not to be worshiped.
These verses also show that blessings of fertility come from God. Fertility gods were worshipped back in Egypt, thinking that these deities could help them with multiply their flocks and help them in bearing offspring for themselves. Moses says in effect: "It is God who gives blessings of children."
