I think everyone is looking at this too stupidly. If god does exist, it cannot be defined. Maybe every single one of us "has god inside of us" or something similar, but we don't know.

You cant prove it doesn't exist, ever(It is impossible to prove that god does not exist, for obvious reasons). However, you can prove it does exist(If it were to present itself clearly thats proof), and I think that in itself is a reason for its existence.