They definitely are. The universe is the reality in which you live. If folks can't make sense of reality, then there's no justification for banning hard drugs at all. If no god ever shows up to introduce himself, then he's definitely not worthy of any kind of recognition.
What you say is true, regarding the universe. However, the very definition of God means something supernatural. Modern science is built on a fundamental premise that they can only consider natural phenomenon. Anything supernatural is outside the bounds of modern science.