What is religion? What does the domain of religion cover? What is excluded? Does opinion eclipse knowledge in marking the boundaries? Should we allow empirical self-identification claims from self-proclaimed religionists to veto any offending established knowledge of what the religion is? I contend that an atheist who claims he is nonetheless a practitioner of Judaism, Christianity, or Islam does not alter the fact that the three Abrahamic religions are monotheist. Atheist Judaism, for instance, is an oxymoron born of an arrogant subjectivity that offends reason itself and therefore cannot be valid.
The full essay is at "Religion as an Academic Area of Study."