In this essay I describe seven central characteristics of Philip Quinn's approach to the epistemic challenge of religious diversity as they surface in his responses to other contemporary approaches. In the process an assessment is given of Quinn's contribution, and continued relevance, to the contemporary discussions about this topic. The first three sections describe Quinn's confrontations with Alvin Plantinga, William Alston, and John Hick. The next section presents critical comments on Quinn's unique notion of thinning.