Irreligious

His irreligious statements are offensive.

The irreligious scoffed at the bishop's interpretation.

Young South Koreans are turning away from religion, as the proportion of the irreligious approaches 60% in South Korea.

This article on religion may interest you: "The Relationship between Religion and Deviance in a Largely Irreligious Country: Findings from the 2010 China General Social Survey."

Irreligious people constitute 13.3 percent of the population of the United States and 10.6 percent of its physician workforce.

[T]he virtuous reader may condemn her for showing too great regard to a base-born infant, to which all charity is condemned by law as irreligious […]