You are the being that is asking the questions. The question "who am I" is self answered. For a question to be asked there needs to be a conscious to ask it.
What you are really asking is WHAT are you.
You are a self made being. A consciousness that builds itself through what it learns using it's senses about the objective reality it lives in.
Who is god? That depends on what is god.
After a lot of thought I think the best way to define the concept of god is: humanities lazy answer to their natural inclination to ask "why"
