The crossword solution for the term 'follower of a certain belief' is DEIST, which is a five-letter word. A deist is someone who believes in the existence of a higher power, but does not necessarily follow any organized religion. Deists typically believe that this higher power created the universe, but does not intervene in its day-to-day workings. They also reject the idea of divine revelation and instead rely on reason and personal experience to understand the world.