Well, I don't think I can give you a number because I am not willing to assume that God is a person. It all depends on what people think of when they use the word God, in many cases I may say not at all because I already know for some people it's just a thought, and atleast I know what the witness thought is already, and there is neither a need nor desire to "know" that idea. Now I am all for this desire actually, but I think it's important to know the difference between knowing the truth of things rather than wanting to know how to fit reality into a framework which we've assumed to be the truth. It may just be that the first step is to let all those preconceived notions go.
"I'm astounded by people who want to 'know' the universe when it's hard enough to find your way around chinatown."
- Woody Allen.