The phrase "a devout fan" is correct and usable in written English.
It can be used to describe someone who is very dedicated and passionate about a particular person, team, or interest, often in the context of sports, entertainment, or hobbies.
Example: "As a devout fan of the band, she never misses a concert and knows all the lyrics by heart."
Alternatives: "a devoted fan" or "an ardent supporter".
Is there anything more childish than being a devout fan?
I was a founder member of the Beatles' fan club, a devout fan.
Never a devout fan, I was surprised by how coherent and forceful the Pixies sounded at the Hammerstein show.
Notre Dame Athletic Director Jack Swarbrick is a devout fan of the mystery writer Harlan Coben, whose hallmarks are clever plot twists and surprise endings.
He watches Israeli news shows, via satellite, throughout the day, and is a devout fan of the Ha'gashash Ha'chiver (Pale Pathfinder), a popular Israeli comedy troupe that performed for decades.
If you're a devout fan and missing the series, its sister discussion show Talking Bad is also on Netflix and may be worth checking out, if just to reminisce on the weekly theorising that gripped us.
But also being a congenitally devout fan of baseball, I can't resist speculating on the cultural differences that the two sports embody and bring to light.
Though many may associate Amos with their high school years, she still has a large and devout fan base, one that music journalist Chuck Klosterman once ranked as the second most dedicated fan base in music (after Slayer, of course).
Even though they are from opposite ends of the world, both acts share an equal (and devout) fan base.
While YouTube videos have long displayed their view counts to the public, until this point it hasn't been possible to tell if the hits were coming from a wide audience or just a few devout fans who repeatedly watched the same clips.
Fueled by their eclectic and improvisational fusion of American musical genres, they developed an extremely loyal and devout fan base that literally spent their lives following them from concert to concert -- city to city, state to state, and country to country.
