Who is God?

Existence of God is debatable and the whole world is divided on it. I am an atheist, so for me God doesn't exist, but that doesn't mean God doesn't exist. Who is God? 

To me, it is that person who gives you another chance at life when no one else does. To me, God is any person who can forgive you for your mistakes, when no one else would. To me God is someone who helps you when no one else does.

Or maybe God really doesn't exist, and I merely conjured up this idea of God, because that is what I need her to be so that she forgives me, helps me and accepts me.

Again its a far fetched wish, a real work of imagination, but whatelse a hopeless me can do? Boy what would I give if this dream came true, every single hair on my head and my whole life.