Despite Marx’s claim that criticism against his views from a religious standpoint are not deserving of serious examination, I try to offer a critical examination of Marx’s epistemology of religion from the viewpoint of Reformed epistemology. Although Marx himself never set forth a systematic epistemology, let alone an epistemology of religion, his writings nonetheless provide an adequate resource to reconstruct his views on the matter. Given this, I set out what I take to be characteristic of Marx’s epistemology of religion and provide the meta-context in which the epistemological issue is framed. In light of Reformed epistemology, I then provide a critique of Marx’s criticism by turning his own argument on its head to the effect that there is significant likelihood that his view is both false and irrational. Finally, I defend against a possible objection.