It is a simple fact that throughout the history of the world just about everyone has believed in some sort of god. Religion, like music and art or our longing for good relationships, is one of the few things shared by every human culture that has ever existed.
Even today, 92% of people still acknowledge the existence of some kind of god. Of course, some people (less than 5%) are still atheists. They argue that the beautiful complexities of the universe are just accidents. But most people follow the logic of the ancient poem found in the Bible:
But who is God?