What do you mean about person who does'nt believe in God?
I think we cant have any difinetion about God
we just must say : God is greatest
God do exist and it does exist inside our beautiful heart in the form of goodness.If we all always do good things and help others it will be as equal of going to temple or church.There is one religion which exist on earth and that is Humanity. God is one and he stays everywhere.