Your answer is a cop-out.
Obviously if there is a creator, our ability to comprehend him would be very limited - unless he chose to reveal himself. However, a creator DOES offer an explanation of first cause. Am I curious about his origins? Absolutley.
If there is NO creator, then my question stands - what physical law allows for everything from nothing?
The better question is what physical law do you think precludes it?
There is, of course, no such physical laws, but there are self-consistent theories that do not require a beginning of time, at least time as we observe it.
Postulating a creator to solve the problem of existence is the intellectual equivalent of stamping your foot and shouting "because I say so!"