Once upon a time, in an ocean far, far away, there lived a boy amoeba named Adam and a girl amoeba named Eve. The tide swept them together and they coupled and in time they had two munchkin amoebas they called the first one Cain, because they could, and they called the second one Abel, because they were able.
In time the family found their way out of the ocean and into a stream. Adam built a wall across it to hold back the fresh water.
Eve Amoeba said, "What's that?" but Adam didn't know and could only repeat his name. He thought that if he did that three times it was as good as registering the patent. So he said, "Adam, A-dam, a dam."
And that's how the world's first dam was built and why it's called a dam.
So now you know hy people were put on Earth. It was to build dams.
People were not "Created" for any exact purpose, we evolved over millions of year to what we are today. The above statements saying our purpose is to "Worship God" is absurd, why would an all powerful, all knowing god feel he needs to have little humans walk around all day just to show worship to him? Follow my rules and you'll be rewarded, if not you'll roast forever. Sorry I cannot and do not buy it.
It's really no different then Warren Jeffs of the FLDS, who seems to put himself to the point of being God to his followers. Telling them what they can and cannot do even to the point of marriage, sex life, and food.