How it comes you only refer to earth? What about the immense universe and its laws we still ignore? How do you know that other life-laws completely different from ours do not exist elsewhere on other planets in more hostile environment without the presence of water or air? Just watch how the universe exists and the new discoveries how life can evolve in the most hostile and toxic environment. Do not take earth as an example of how other planets should look like for the growth of life on them. Something has created all these, there is no doubt, but people unable to describe what this power is, created their gods "according to their image and way of life", as Aristotle quoted. This is the question you maybe should have pointed out. Hence in all religions, gods have human form and propensities. So, we see gods with animal heads, black, white, yellow, or red figure etc etc......... and the stories about them........ a real mish-mash of myths, fairy tales and unlimited imagination!