Belief of more than 2 billion people (5)

I believe the answer is:

islam

(Other definitions for islam that I've seen before include "Faith with five pillars" , "Monotheistic religion" , "Religious faith of Muslims" , "Religion based on teachings of Muhammad" , "Koran its scripture" .)

I've seen this clue in the LA Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.