I am saying that you do not have to see the initial stage of something to start the scientific process, which you implied. You can look at life today and want to work backwards, and it is just an valid.
From observation today, we see life. We also see extinction. Tens of thousands of species go extinct each year. We have not observed any new species evolving. That leads to a downward trend, not the upward the evolution implies and requires.
Let's just take mammals so that we can deal with understandable numbers. There are approximately 5000 known species of mammals alive today. In the past 400 years, 89 species have gone extinct. No new species have evolved. From this observation we can work backwards and see that there used to be more species of mammals alive, not less as evolution states. If evolution were true, we would constantly see new life, an upward trend. The facts show that the opposite is true.