Which term refers to something that is against religion?

The term that refers to something that is against religion is "sacrilegious." This word specifically describes acts, behaviors, or attitudes that show a disrespect or violation of sacred things or places, and it implies a serious breach of religious principles. When something is labeled as sacrilegious, it conveys a strong sense of offense against religious norms or beliefs, making it particularly relevant in contexts where respect for the divine or sacred is paramount.

Irreverent, while also suggesting a lack of respect, does not necessarily imply an active opposition to religion but rather a casual or disrespectful attitude towards aspects of religion without the implication of violating sacredness. Orthodox refers to conforming to established doctrine, especially in a religious sense, which is the opposite of being against religion. Devout pertains to having a strong religious commitment and faith, further reinforcing its association with reverence rather than opposition. Therefore, sacrilegious stands out as the most accurate term to describe something that goes against religion.