As commonly practised, philosophy is the attempt to find good reasons for conventional beliefs. In Kant's time the creed of conventional people was Christian, now it is humanist. Nor are these two faiths so different from one another. Over the past 200 years, philosophy has shaken off Christian faith. It has not given up Christianity's cardinal error — the belief that humans are radically different from all other animals.
The Deception: At the Masked Ball (p. 37) - Straw Dogs: Thoughts on Humans and Other Animals (2002)