It is impossible to define g-d just as it is impossible to define science or anything else. All words represent signs which we believe to be universal. But their definitions remain a mystery and the best we can do is deduce or infer from actual experience. For this reason the only form in which g-d can be accessed is by inner experience which may reflect general and universal aspects but which is specific to the individual or group that can document the experience. The same is true of science. It is only in the measured reality of actuality - in actual physical proof that science is either borne out or shown to be, if not imperfect, fallible. All sides of the religion debate are in error if they believe we can do more than Moses was able to do when he inquired who the deity was. The reply he got was I am who I am and I will be who I will be. Everything else is a representation and this is true mainly because we exist in time and the grammar of the statement recognizes that.