Constitutionality of Teaching Intelligent Design

Hi Bill,
Thanks for the reference. I am an engineer and am having difficulty distinguishing the scientific validity of the "Big Bang theory" from any other assumption of origins relative to a Supernatural event. No matter how far back in time science ventures in hypothesizing origins - it will eventually result in an immaterial supernatural event. And since the law of Entropy requires a starting point (as acknowledged by Steven Hawking), is it truly scientific to assume that starting point came from "nothing"?
Given the choice, I believe - most common sense folks will say "No thing ever comes from nothing!"
What are your thoughts?