Astrid Stawiarz/Frazer Harrison/Getty Images For some, faith and religion is an important part of their lives, even for celebrities. We know that celebrities like Justin Bieber, Tim Tebow, and Jordin Sparks are Christian, that Zayn Malik is Muslim, and that Tom Cruise and John Travolta subscribe to Scientology. What you might not know is that some celebs are Mormon — some are practicing, while others were raised with Mormon beliefs.Katherine Heigl Cindy Ord/Getty Images The "Grey's Anatomy" actress was raised in a Mormon household from the age of 7.