Leah Remini to discuss Scientology on '20/20': 'Being critical of Tom Cruise is being critical of Scientology itself'

Leah Remini Is Penning a Tell-All Memoir About the Church of Scientology

Leah Remini is discussing why she left the Church of Scientology in an exclusive 20/20 interview on Friday, Oct. 30.

In an ABC News promo, the actress sits down with reporter Dan Harris to discuss her experience with the Church — and the reasoning for severing ties with it.

"The decision to leave is you're giving up everything you've worked for your whole life," she says in the clip. "I feel that people need to understand this has been my whole life and I want them to understand how it happens. And so as time goes on, you start to lose touch with the real world."

Leah Remini talks leaving Scientology
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Leah Remini to discuss Scientology on '20/20': 'Being critical of Tom Cruise is being critical of Scientology itself'
CULVER CITY, CA - AUGUST 12: Leah Remini and family arrive at the 3rd Annual My Brother Charlie Family Fun Festival at Culver Studios on August 12, 2012 in Culver City, California. (Photo by Araya Diaz/FilmMagic)
GOOD MORNING AMERICA - Leah Remini is a guest on 'Good Morning America,' 7/9/14, airing on the ABC Television Network. (Photo by Fred Lee/ABC via Getty Images)
WATCH WHAT HAPPENS LIVE -- Pictured (l-r): Leah Remini and Steve Guttenberg -- (Photo by: Charles Sykes/Bravo/NBCU Photo Bank via Getty Images)
BEVERLY HILLS, CA - JANUARY 14: Leah Remini and TV personalities Val Chmerkovskiy and Cheryl Burke attend the 2014 UNICEF ball presented by Baccarat at Regent Beverly Wilshire Hotel on January 14, 2014 in Beverly Hills, California. (Photo by Tibrina Hobson/FilmMagic)
DANCING WITH THE STARS - 'Episode 1708' - The seven remaining couples competed in two rounds of dance. In the first round, each couple took on a dance style they have not previously performed including the Tango, Argentine Tango, Contemporary, Viennese Waltz, Jazz, Disco, and Foxtrot. The couple to receive the highest total score from the judges in this round received immunity and not be subject to elimination. In the second round, the six remaining couples competed in a thrilling head-to-head 'dance off' competition. The winning couples of the 'dance off' round were awarded additional Judges' points that were added to their overall score for the night, on 'Dancing with the Stars,' MONDAY, NOVEMBER 4 (8:00-10:01 p.m., ET). (Photo by Adam Taylor/ABC via Getty Images) LEAH REMINI, TONY DOVOLANI
UNIVERSAL CITY, CA - OCTOBER 23: Leah Remini (L) and Tony Dovolani visit 'Extra' at Universal Studios Hollywood on October 23, 2013 in Universal City, California. (Photo by Noel Vasquez/Getty Images)

Remini describes during the interview how she and her family joined Scientology when she was a child and continued with her commitment to the Church for 30 years until she parted ways as an adult, according to ABC. "The mindset becomes us against them," she explains in the clip.

"Being critical of Tom Cruise is being critical of of Scientology itself ... you are evil."

The hour-long special airs Oct. 30 at 7 p.m. on ABC.

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