The Collaborative International Dictionary of English v.0.48:

Nonconforming \Non`con*form"ing\, a.
   Not conforming; declining conformity; especially, not
   conforming to the established church of a country.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nonconforming
    adj 1: not conforming to established customs or doctrines
           especially in religion [syn: nonconforming,
           nonconformist]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "nonconforming":
   alienated, antiestablishment, at odds with, at variance with,
   breakaway, contrary, counter-culture, deviant, differing,
   disagreeing, disobedient, disregardful, dissentient, dissenting,
   dissident, froward, in opposition, inattentive, inconstant,
   indisciplined, inobservant, lawless, naughty, negligent,
   nonadherent, noncompliant, nonconformable, nonobservant, obstinate,
   opposing, recalcitrant, recusant, refractory, sectarian, sectary,
   self-willed, transgressive, unadaptable, unadjustable, uncompliant,
   uncomplying, unconforming, underground, undisciplined, unduteous,
   undutiful, unfaithful, unloyal, unobservant, unsubmissive, untrue,
   violative, wayward, willful