The Collaborative International Dictionary of English v.0.48:

Zealotry \Zeal"ot*ry\, n.
   The character and behavior of a zealot; excess of zeal;
   fanatical devotion to a cause.
   [1913 Webster]

         Enthusiasm, visionariness, seems the tendency of the
         German; zeal, zealotry, of the English; fanaticism, of
         the French.                              --Coleridge.
   [1913 Webster]

WordNet (r) 3.0 (2006):

zealotry
    n 1: excessive intolerance of opposing views [syn: fanaticism,
         fanatism, zealotry]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "zealotry":
   bibliolatry, bigotry, charismatic gift, charismatic movement,
   charismatic renewal, excessiveness, extravagance, extremeness,
   extremism, fanaticalness, fanaticism, fervor, frenzy, fury,
   gift of tongues, glossolalia, hysteria, infatuation, mania,
   monomania, obsession, obsessiveness, overambitiousness,
   overanxiety, overanxiousness, overdevoutness, overeagerness,
   overenthusiasm, overpiousness, overreaction, overreligiousness,
   overrighteousness, overzealousness, pentecostalism, perfervidness,
   rabidness, radicalism, revival, revivalism, sanctimony,
   single-mindedness, terrorism, ultrazealousness, zeal, zealotism,
   zealousness