So your an Athiest

[Wyrd of Gawd]

The major flaw is thinking that current animals and plants are resistant to change. We know that plants evolve. Scientists create new ones regularly. Animals, including humans, also change over time. In 100,000 years humans will look completely different from us. If you could live for the next 100,000 years it's doubtful you would even notice the daily changes. They would only be apparent if you compared them at tens of thousands of years apart. In other words, a span of 100 years is too short. You need to compare at 25 thousand, 50 thousand, 75 thousand, and 100 thousand year points to see the changes. At the 500,000 year point you would probably think you are looking at space aliens from a distant solar system instead of humans from Earth who have always been here.