Evolution, Christianity, and a 4+ billion-year-old earth are perfectly compatible.
The first thing that God said wasn’t “good” was that man was alone.
Everything prior to the Fall (of Adam, with a specific sin) was held in a state of perfection, with no death, disease, predation (all were plant eaters), mutations, etc. This is biblical.
God didn’t leave your option open. Just as Jesus didn’t leave open the option that He was “just a good man and prophet”.