We descended from cave men, cave men descended from upright walking apes, upright walking apes descended from?

…a species of primate in between a chimp and a gorilla? A species of primate in between a chimp and a gorilla descended from the common ancestor of all primates? The common ancestor of all primates descended from the common ancestor of all placental mammals? The common ancestor of all placental mammals descended from a mutant reptile that had warm blood and gave birth to live young instead of laying eggs? A mutant reptile that had warm blood and gave birth to live young instead of laying eggs descended from a mutant amphibian that laid eggs that could survive without water? A mutant amphibian that laid eggs that could survive without water descended from a mutant fish that could take oxygen from the air as well as the water? A mutant fish that could take oxygen from the air as well as the water descended from the common ancestor of all animal life on this planet? Really? No creator god required?