What does "irreligion" mean?

The state of being irreligious; irreligious sentiment or thought.

What is a synonym for "irreligion"?

Common synonyms include: apostasy, atheism, backsliding, desertion, fall from grace, godlessness.

Pronounced //ˌɪɹ.ɪˈlɪd͡ʒ.ən//.

/ˌɪɹ.ɪˈlɪd͡ʒ.ən/ noun

noun ·Rare ·Advanced level

Noun

1
The state of being irreligious; irreligious sentiment or thought. uncountable, usually
"Near-synonyms: atheism, agnosticism"
2
the quality of not being devout wordnet

"I sense that irreligion is growing everywhere around this world."

From French irréligion, from Latin irreligiō. By surface analysis, ir- + religion.