An "epistemological question" is a question that asks about how we know things or how we can gain knowledge about something. It looks into the nature of knowledge, what it is, and how we can understand the world around us. Full definition
Much of my early research and writing were preoccupied with epistemological questions of faith. (religion-online.org)
Philosophy and theology might make an important contribution to this fundamentally epistemological question by, for example, helping the empirical sciences to recognize a difference between... evolution as the origin of a succession in space and time, and creation as the ultimate origin of participated being in essential Being.» (faith.org.uk)
At the heart of Luther's theology of the cross is a profoundly epistemological question: the question about knowledge of God. (religion-online.org)