My world is very similar to ours...most people believe in one God, who created all things, but depending on the race or culture, has no gender, but like most cultures in our world, is addressed as Him and is known by many names. For the most part, I use the names of the Christian/Jewish God..Adonai, Ramathel, Shaddai. There are polytheistic cultures in my world as well as those who worship demons. I've also created an antithesis or polar opposite for this one God, I call "The Adversary of Creation" or simply "Adversary".