Why did God create humans?

One belief is, it was an answer to the fall of satan. As satan was sentenced to the lake of fire, but looks like satan appealed his sentence and the creation of the earth as it is now and humanity is Gods reply to satans appeal.

(I edited) but this is from a small book by R.B. Thieme jr. The Angelic Conflict
Before the advent of human history, Satan arrogantly rebelled against his Creator. He wanted to make himself “like the Most High” and recruited one-third of the angels to follow him. God justly condemned Satan and his fallen angels to spend eternity in the lake of fire. Satan (possibly) appealed the sentence, claiming unfairness—questioning how a loving God could cast His creatures into hell.
The current earth is now the battleground where Satan seeks to outmaneuver God, prove the judgment unfair, and foil the execution of his sentence. Satan will not suffer defeat without an intense struggle.

God created man to resolve this angelic conflict. Human volition is the focal point of the firestorm. Will man choose God’s grace plan of salvation or follow the arrogant system of Satan? Through the freewill decisions of mankind, God proves to Satan His perfect justice and love again and again.

tonychanyt said:

28 God blessed them and said to them, “Be fruitful and increase in number; fill the earth and subdue it. Rule over the fish in the sea and the birds in the sky and over every living creature that moves on the ground.”

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We have dominion and authority, so God has to work with us. This is why we are joint heirs with Christ.
Genesis 1:26
"Then God said, 'Let us make mankind in our image, in our likeness, so that they may rule over the fish in the sea and the birds in the sky, over the livestock and all the wild animals, and over all the creatures that move along the ground.' So God created mankind in his own image, in the image of God he created them; male and female he created them. God blessed them and said to them, 'Be fruitful and increase in number; fill the earth and subdue it. Rule over the fish in the sea and the birds in the sky and over every living creature that moves on the ground.'"