[aruanan]

The fact is, Calvin thinks, one who does not believe in God is in an epistemically defective position-rather like someone who does not believe that his wife exists, or thinks that she is a cleverly constructed robot that has no thoughts, feelings, or consciousness.

That's "epistemologically".

[f.Christian]

Main Entry: ep·i·ste·mic
Pronunciation: "e-p&-'stE-mik, -'ste-mik
Function: adjective
Date: 1922
: of or relating to knowledge or knowing : COGNITIVE
- ep·i·ste·mi·cal·ly /-mi-k(&-)lE/ adverb