Theory 1a: Lightning is forged by Hephaestus and sent to earth by Zeus.
Theory 1b: Lightning is an electrostatic discharge... etc. etc. (the details can be easily found on the web).

Theory 2a: Volcanic eruptions are caused by the Goddess Pele using her magic stick Pa'oa and earthquakes are caused by her stamping her feet (both of which occur when she is angry).
Theory 2b: Volcanic eruptions are driven by the ascent of magma.. etc. etc. (the details can be easily found on the web)

Theory 3a: Angels move the planets.
Theory 3b: See Newton, Einstein, etc.

Lather, rinse, repeat.

Suppose that you will grant me that all the 'b's are accepted as true and all the 'a's rejected. Then one could form the theory, based on this evidence, that supernatural agents are unnecessary to explain natural events. On the basis of that theory, we can choose between your god/no god theories...