What Is God?

I have a question for you guys today.
If I ask who is God some will say Yahweh, Allah, Buddha, Vishnu, Zeus,
Ra, Sango, Domino Reverad e.t.c
This beliefs are because of the various religious doctrines, various
religions say they know who God is. That God is the God of their
religion.
Now I got this question, what is God?
To me God is that element that is responsible for the big bang and the
recycling of lives (nature). I see God as nature.
Please drop your answers about what is God not who is God.
Thanks.
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