Alvin Plantinga is an American-born philosopher of religion and one of the leading advocates of contemporary Christian philosophy. Plantinga deals with numerous problems of the monotheistic Christian religion, including the problem of religious pluralism. One of the most common questions an atheist asks a believer is, "Why your God and not someone else's?" Therefore, this paper aims to present Plantinga's answer to the question of religious pluralism. We will achieve this goal by developing Plantinga's theory of "proper functioning", a thesis (...) that atheism represents a state of incorrect functioning of cognitive mechanisms. We can respond to the problem of religious pluralism through positive or negative apologetics. Plantinga has chosen negative apologetics, arguing that the believer is under no obligation to justify the truth of his beliefs when confronted with the problem of religious pluralism. Although Plantinga provides numerous convincing arguments supporting his position, we will show that we can provide a positive apologetic by returning to the foundations of Plantinga's understanding of intentionality and mental representations. In so doing, we will demonstrate a broader range of ways a believer can defend his epistemic position and connect Plantinga's epistemology of religion in relevant ways to contemporary theories of cognitive psychology and philosophy of cognition. (shrink)