Life is one of the biggest mysteries in the world. If it wasn't, we wouldn't spend so much time researching it. God has about 3 areas that none of us can claim to control all at once. Life, the soul (please don't launch into a big discussion about the soul), and the natural forces. Nobody except God can claim to CONTROL those. Lightning is simply one aspect of the natural forces. But if man can create life then he can claim control of it because he knows and can make it. Take the Egypitian Gods. They had one God for every force in the natural world. If they controlled one force they could effectively claim to be a God. It didn't matter if they were wrong that it made them a God. They could still claim it because they didn't know any better. It is like now. If we discover the mystery of life than we have the belief that we can claim to be God. We may be wrong but since when has that ever stopped anyone.
Why would that have anymore effect that discovering what caused lightning?
Because after man claims godship then it is only a matter of time before he decides there are no other Gods. Then he will proceed to get rid of them. Man doesn't like to share leadership with anyone else.
P.S. Sorry if this doesn't make a lot of sense. I was rushing.