rwfromkansas is right.
God does not need us. To believe otherwise indicates a fundamental lack of understanding of Who He Is.
You fallaciously confuse "need" with "want" in a straw man. Sure God does not "need" us in the sense that there is any external necessity compelling His hand or rendering him the poorer if He does not act or the richer if He does act, but it is perfectly certain that God "wants" us. He put us there on purpose... what man ever popped into existence of his own accord, without God going to the trouble? He made a plan for us and prepared us.