Please, explain what it means to be an atheist.?

Is it you believe there is no God, and you life is in your hands? Is that you make your own destiny? Explaine how you can manage all the wonders of this Earth, this lifetime without devine intervention? Really, one human cannot even stop cancer from overtaking his body. One human cannot stop the ocean from spilling onto the land, one human cannot shut the sun down. So how can you explaine that you are here on Earth without God's permission?