The “Orange is the New Black” star said she stopped practicing the religion when she became a mom almost five years ago.
“If you let me just tell you what it was really about, you would say, ‘No f**king way,'" the comedian said Cruise told him.
"He is an abusive person. I witnessed it, I’ve been a recipient of it on a small level," Remini wrote. "This is the real Tom."
The California congresswoman, who is a top contender to become Joe Biden's running mate, explained her 2010 comments on Twitter.
The outspoken Scientology critic said Newton had "huge balls" following her candor about working with Cruise on "Mission: Impossible 2."
The "That's '70s Show" actor was charged in Los Angeles with forcibly raping three women in the early 2000s.
He could face 45 years to life in state prison if found guilty.
The two high-profile Scientologists have been linked together in the tabloids for years.
A&E's "Scientology and the Aftermath" is ending after three seasons, but Leah Remini isn't giving up the fight.
The lawsuit filed in Los Angeles accuses the actor and organization of stalking, intimidation and conspiracy stemming from rape allegations against the actor.