1) Atheistic 2) Atheistical 3) Ethnic 4) Heathen 5) Heathenish 6) Impious 7) Lapsed 8) Nonchurchgoing 9) Nonobservant 10) Not religious 11) Pagan 12) Unbelieving 13) Ungodly 1) Atheistic 2) Blasphemous 3) Heathen 4) Heathenish 5) Impious 6) Lapsed 7) Nonchurchgoing 8) Nonobservant 9) Pagan 10) Profane 11) Unbelieving 12) Ungodly 13) Unreligious 
• (a.) Destitute of religion; not controlled by religious motives or principles; ungodly. Cf. Impious. • (a.) Indicating a want of religion; profane; wicked; as, irreligious speech.
Ir`re·li'gious adjective [ Latin irreligiosus : confer French irréligieux .] 1. Destitute of religion; not controlled by religious motives or principles; ungodly. Confer Impious . « Shame and reproach are generally the portion of the impious and irreligious ...
[adj] - hostile or indifferent to religion
irreligious 1. Hostile, opposed, or indifferent, to religion. 2. Not religious; not practicing a religion and feeling no religious impulses or emotions.
adjective hostile or indifferent to religion
not religious; not practicing a religion and feeling no religious impulses or emotions. · showing or characterized by a lack of religion. · showing indifference or hostility to religion: irreligious statements.