Then, where did the mammals come from? Paleontology does give us fossils of reptiles that look a lot like primitive mammals. The process is incremental and takes small changes over generations. Even the so called Cambrian explosion during which many new species are found in the fossil record took more than 20 million years.
That is exactly my point. How is “evolution [] a testable scientific theory” when it can take more than 20 million years? How do we test that? We can’t possibly replicate it. And what about the Ancient Aliens? What is their role over the past 20 million years?