WordNet sense 1 (a Protestant in England who is not a member of the Church of England):

chapelgoer

WordNet sense 2 (someone who refuses to conform to established standards of conduct):

recusant

WordNet sense 3 (not conforming to established customs or doctrines especially in religion):

nonconforming

WordNet sense 4 (breaking with convention or tradition):

unorthodox

WordNet sense 5 (not conforming to some norm or socially approved pattern of behavior or thought):

unconformist