I am quite nihilistic, but if I had to name my god then my god's name is Entropy. Entropy is the amount of disorder or chaos in the universe, and the laws of thermodynamics dictate that Entropy only ever increases, that the natural tendency of things is to become less ordered over time. There can be small pockets of order (such as molecules coming together to form human beings) but after we die our constituent atoms eventually return to the universe. This is not a theory, it is a scientific law, meaning it is just as real and substantiable as gravity. If I have to believe in some higher power that controls everything, then I believe in Entropy.