AbstractWhy is there no sustained tradition of argument concerning the existence of a supreme (omniscient and omnipotent) being who is perfectly evil, as there is about one who is perfectly good? Arguments which are reflections of the ontological, cosmological and teleological arguments, and arguments based on personal experience or the occurrence of antimiracles (harmful events not explicable by science) could have provided at least as good grounds for belief in such a being (ie for antitheism) as their originals in fact provide for theism. An imaginary encyclopedia entry, in which fictional antitheistic arguments and thinkers are presented, illustrates this point. The reason for the nonexistence of a tradition of antitheism seems therefore to be that it is merely emotionally, not that it is rationally, less inviting than theism.