The Collaborative International Dictionary of English v.0.48:

Hagiologist \Ha`gi*ol"o*gist\ (-[-o]*j[i^]st), n.
   One who treats of the sacred writings; a writer of the lives
   of the saints; a hagiographer. --Tylor.
   [1913 Webster]

         Hagiologists have related it without scruple.
                                                  --Southey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hagiologist
    n 1: the author of a worshipful or idealizing biography [syn:
         hagiographer, hagiographist, hagiologist]