Laura Prepon talked about how much she felt that Scientology helped in her work as an actor in an interview with the Scientology publication “Celebrity Magazine.” “When you study the Basics [a series of books by founder L. Ron Hubbard], you get all these tools that you can apply immediately … I work with a bunch of different personalities. I work very long, intense days with them. Having these tools makes my job so much easier in dealing with things that will inevitably arise.” She also referred to Scientology as “magic” in how it helped her as a person and a performer, and that it made her feel “more me” (via Defamer).
It sounds like leaving Scientology was because of the inevitability of life changing. “If motherhood has taught me anything so far,” she told People, “it’s that something can work out for a period of time and then you move on.”
Other high-profile actors and entertainers who have left Scientology include Leah Remini, Demi Moore, Tiffany Haddish, Katie Holmes, and Nicole Kidman (via Insider).