From Longman Dictionary of Contemporary Englishirreligiousir‧re‧li‧gious /ˌɪrɪˈlɪdʒəs◂/ adjective formal RRopposed to religion, or not having any religious feeling
Examples from the Corpus
irreligious• He was, in fact, not irreligious.• It comes with equal challenge to the religious as to the irreligious.• The weak are bullied by the strong, the little by the big, the pious by the irreligious.• This is not to say that Richard was irreligious.• To be a layman, even to be anticlerical, is not necessarily to be irreligious.• To do nothing on behalf of the socially deprived is to him basically irreligious. 