I think an even more important question is how can you know God until you've sought God with an OPEN MIND? There will always be more to learn about the All of Everything, no matter how much you know.
Most people are willing to be told their belief, settling either in religion, atheism or science. Very, very few accept or understand that God is all of these and more. Very few have the courage to stand where science and faith meld into one perfect synthesis. A singularity, a zero-point of truth that really would be their awakening.