Epistemology (\i-ˌpis-tə-ˈmä-lə-jē\) is the study of the nature and grounds of knowledge especially with reference to its limits and validity. Apologists have their own theory on the validity of knowledge--that is, knowledge is only valid when grounded in the divine. There is no truth, only Truth. The capital “T” relates the word to the imaginary and changes the definition to the less accepted yet, in their minds, more accurate attribute and/or synonym of God.
The apologist is applying the philosophical argument that objective truth is impossible to determine to the naturalistic worldview. This speaks to my aversion to pointless philosophy, and yet, I must admit, I can’t refute their claim. When I take into account thought experiments in which our reality could be an elaborate holographic simulation or our brains could be drugged and electrically stimulated to perceive things that are false, I intellectually have no choice but to accept that any objective truth is out of my jurisdiction. Where the apologist goes wrong is their claim of exception.
all bets are off, giving any epistemological high ground to the naturalist.