Why? We can theorize quite realistically there is an element 138, even though the current theoreticals only number to 118 without first having proof that 117 can be stablized. We theorize singularities exist, even though we have no proof that a black hole is really just that. We call that stuff science. We can even theorize various ways the universe was originated and those qualify as science with no proof there ever was a big bang. In fact we can find many books inspired about that subject that has no proof, but to make a statement that may have easily have been said "God inspired Moses, an historically recorded member of the Hebrew race, by communicating to him through the 5th dimension..." is verbotten? Sounds like a human rights violation to me.
In fact, if you put "flame speaker" in a search, you'll find we can make sound come out of a flame by inserting an electrode inside it to ionize the outer gradient areas of the flame. I first saw that in Electronics Illustrated when I was about 12.
No. I don't need proof God exists to make such a statement. Neither do I need any more proof that Moses existed than we do that Aristotle or Caiphas existed.
I do appreciate your adherence to the topic, though