antichurch

noun
  1. opposition to or rejection of the Christian church or organized religion
  2. Usage: often used in historical or theological contexts
  3. a movement, organization, or ideology that opposes institutional Christianity
  4. Usage: rare; primarily academic or historical usage
adjective
  1. opposed to or hostile toward the church or organized religion
  2. Usage: descriptive; often used in scholarly or polemical contexts

Examples