All throughout history people have invoked gods of various kinds, including incomprehensibly strange creators. Crediting an almighty god as the creator of the universe is an acknowledgement that the universe is so complex and beautiful that only a being much greater than human could create it.
People from every inhabited corner of the planet have told stories about the creator and how he or she brought the world into existence. Creators have been seen as male and female, wonderful and awesome, terrible and unknowable. They are usually the oldest being in any pantheon.
Modern scientists too have a creation story: the Big Bang. Some modern people do not believe God set off the Big Bang. In fact, many millions of people from various traditions around the world, including Christians and Muslims, still believe in fundamentalist creation stories.