1. a person who is opposed to or lacks religious belief
Usage: formal

Examples

• The irreligionist argued against the inclusion of prayer in public schools.
• As an irreligionist, she found the religious ceremony uncomfortable.
• The debate featured both devout believers and committed irreligionists.
• His reputation as an irreligionist made him unpopular in the conservative town.
• The irreligionist movement gained momentum during the Enlightenment.
• She identified herself as an irreligionist rather than using the term atheist.