How many letters does the top answer for “someone who is indifferent or hostile to religion” have?

The most common answer is irreligionist (13 letters).

Crossword clue: someone who is indifferent or hostile to religion

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

irreligionist 13 letters wn-def

someone who is indifferent or hostile to religion

hostile or indifferent to religion 75% similar → irreligious