The bible shows that God is self sustaining and does not need humans to survive. It is because of his will that we exist and is the source of all power. Revelation 4:11 states "You are worthy, Jehovah, even our God, to receive the glory and the honor and the power, because you created all things, and because of your will they existed and were created."
Isaiah 40:26 brings out “Raise YOUR eyes high up and see. Who has created these things? It is the One who is bringing forth the army of them even by number, all of whom he calls even by name. Due to the abundance of dynamic energy, he also being vigorous in power, not one [of them] is missing." So clearly he does not need us for anything.
However he does care for us very much which is why he has made provisions to save mankind from the state that they are currently in. Soon war, sickness, crime and injustice will no longer exist. WOuld you like to learn how? Visit www.jw.org