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That God is a God of relationship is obvious. But God does not need us. It is an aspect of His grace toward us that He desires fellowship with us. He did not create us out of any neccesity or lack in His nature. If anything I think He created us as an act of His justice. Satan said "I will be god." God convicts Satan by his own words. First, He creates a world in which He can demonstrate the nature of God. Then He reveals His nature in the incarnation, vicarious death, and victorious resurrection. God then pours out this grace to the world through the gospel of Jesus Christ. Finally, in the end, He hands over the reins of human society to Satan. Satan tries to live up to the revealed nature of God. He (Satan) creates a false messiah, a false Holy Spirit/witness/prophet, a false church, and a false theocracy. The results are disastrous, God pours out His judgement upon Satan first, and then on humanity, who have reshaped themselves into the image of their spiritual father, the devil. One paragraph history of the justice of God.