How many letters does the top answer for “one of the same religion with another.” have?

The most common answer is coreligionist (13 letters).

Crossword clue: one of the same religion with another.

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

coreligionist 13 letters web-def

someone having the same religion as another person

another word for one 50% similar → ace

another word for same 50% similar → lapp, sami

one belonging to the same clan with another. 50% similar → clansman