It is essential to recognize that within mainstream biology, evolution, meaning descent from a common ancestor, is an accepted FACT. In other words, it is beyond any rational doubt that billions of years ago there were single celled organisms and over time these organisms have evolved into the organisms alive today.
Here the clinical psychologist, who deals with depression, suicide and the personality disorders, equates mainstream biology with rational thought. In other words, what evolutionists say goes. We must accept what they declare to be true, and we must reject what they declare to be false. Any other course is not rational.
It is remarkable, and indeed concerning, how deeply evolutionary metaphysics and dogma have penetrated the academy.
Religion drives science, and it matters.