Most people attached a human name to that mythical man in the sky such as: "Jesus", "Mohammad", "Buddah", ect... In fact, you can attach any human names you want to that mythical man in the sky and you would be 100% correct. Like you, most atheists tend to attach the human name such as: "Alien" to that mythical man in the sky. I can reassure you the mythical man in the sky does exist.