Except that isn’t what the Book says. Since the Book says that God rained fire and brimstone from the sky; that’s what STARTED it. The fired from heaven would then have ignited the petroleum products.
For another instance of fire coming out of the sky, check out Elijah’s showdown on Mt. Carmel.
Raining fire from the sky doesnt mean it could not have come from somewhere on earth. An eyewitness account would not be lying that they saw it rain down from the sky, but not see where it came from.
Not a big deal, just a discussion more than anything.