Leah Remini has quit Scientology.

The 'King of Queens' star has reportedly turned her back on the organisation after allegedly being subjected to years of ''interrogations'' and abuse after questioning the actions of Church of Scientology leader David Miscavige.

A source told the New York Post newspaper: ''It all began when Leah questioned the validity of excommunication of people.

''She is stepping back from a regime she thinks is corrupt. She thinks no religion should tear apart a family or abuse someone under the umbrella of 'religion.' ''

The 43-year-old actress is angry that she was ''blacklisted within the church that she donated millions to and that her family has spent their lives in'' because she queried David's decision to force followers to detach from their family members if they left the cult or its Sea Organisation religious order.

The source added: ''She's from Brooklyn (New York). The church can't hurt her ... they don't have her family, that's all that matters to her.

''It's not about wanting or not wanting to do Scientology ... The issue is that [David] is taking down this church and hurting people and families.''

Remini was mauled by former Scientology Celebrity Centre head Tom Davis earlier this week after she innocently asked on a blog post where David's wife, Shelly - who hasn't been seen in public since 2007 - was during Tom Cruise and Katie Holmes' wedding in 2006.

The Church of Scientology was founded by American science fiction writer L. Ron Hubbard who claimed that extra terrestrial beings were sent to planet Earth by intergalactic ruler Xenu, who then blew up the aliens with hydrogen bombs in a volcano.

These aliens' souls then attached themselves to humans and cause problems that affect the happiness of individuals.