Religion within the Limits of Reason Alone. In that book he argued that religion is really only about one thing, and that is ethics [or] right behavior. In the book he describes Jesus Christ not as God incarnate but as the model for human behavior, the one who showed us how to do our duty. Immanuel Kant believed that reason can show us the right path of ethics. He portrayed Jesus as sort of an early philosopher, along the lines of Socrates but in Palestine, for example. Of course, because there were