The line comes from Final Fantasy X, the 2001 role-playing game from Square, where religious conflict and the teachings of Yevon shape much of the story, giving an accusation like heathen particular weight in its world. Lifted as a standalone clip, it has circulated on soundboards and in short-form edits, where its brevity and theatrical delivery make it easy to drop into unrelated videos. It endures because the insult is old-fashioned, instantly understood and funny when aimed at everyday mistakes rather than actual belief.