Antonym of RELIGIOUS

atheistic
immoral
secular
sinful

The correct answer is A. atheistic.

Atheistic means not believing in the existence of a god or gods. Religious means having or showing belief in and reverence for a superhuman controlling power, especially a personal God or gods.

B. immoral means not having or showing good moral principles; wicked. C. secular means not connected with religious or spiritual matters. D. sinful means wicked or morally wrong.

Atheistic is the most opposite of religious because it directly contradicts the belief in a god or gods.