Next week in my apologetics class at
RMS I'll present the "divine hiddenness" ("culpable nonbelief") argument against God's existence. I especially use the essays collected in the book
Divine Hiddenness (Howard-Snyder & Moser). I'll also use Michael Murray's essay "Why Doesn't God Make His Existence More Obvious to Us?" in
Passionate Conviction: Contemporary Discourses on Christian Apologetics. The entire Murray essay can be read at googlebooks here. See also Murray's "Deus Absconditus" here.