That I don't know HOW lightening is created (not exactly anyway) doesn't mean that I need assume it was Zeus. Of course, I could never proove it wasn't Zeus, even if I COULD explain the process entirely. I don't know from whence came the universe (do you?), but it was once thought to revolve around the earth, eh? Slowly but surely... Anyway, perhaps you should check out some of Right Wing Professor's posts on the subject, he's quite brilliant.
Just because things can be explained naturally, doesn't mean that they weren't created by a supernatural being ( in the sense of being outside nature). This is a physical world and things can be observed and analyzed. But that doesn't *disprove* the existence of God. The idea that as we come to an understanding of what things are and how they work, chips away at the support for the existence of God, is foolishness. I'm certainly glad that the superstition that existed and resulted from ignorance of the natural world and how it works is gone. But OTOH, we don't want to trade it for a whole other kind of ignorance and evil. Religion needs science to help prevent superstition and science needs religion as a conscience.