Rathbun: --he is talking to Matt Lauer like David Miscavige talks to his staff. "You're glib, man, you don't get it. You don't understa--" you know.
When asked by "Nightline" if he supported Cruise's comments on the Today Show, Tommy Davis said: "I support anybody who is going to be out there talking about the dangerous effects of drugs..."
Nightline: But with the greatest respect, Mr. Davis, Tom Cruise is an actor. He's not a medical academic. He's not a clinician. ...Do you really think he's qualified to denounce an entire field of medicine?
Davis: Well, I think your comments right there are actually quite degrading of actors and artists...
Nightline: ...What right do they have?
Davis: They have every right...
Cruise was one of many celebrities to join the Church. In 1998, actors John Travolta and Kirstie Alley told ABC News how much Scientology has helped them.
"The basic thing that I think Scientology helps people with is to rehabilitate their own spirit, their own nature, their own personality that was sort of buried or lost somewhere along the way," said Alley.
"It's given me all aspects of life back to me where I can move through life confidently, I can move through life feeling fulfilled, I look forward to life every day," said Travolta.
Recently, speculation has swirled about Travolta, who famously produced and starred in the film, "Battlefield Earth," based on a book by L. Ron Hubbard.
"Nightline" spoke with Marty Rathbun, who says he audited Travolta.
Nightline: What sort of a man was he?
Rathbun: He's a wonderful man. He's a great guy. He's very love -- one of the more loving persons you ever want to meet, sensitive, caring.
It was at the family's island retreat that Travolta's 16-year-old son, Jett, who had autism, died from a seizure, in January.
"Nightline" asked Davis if the Church had ever advised Travolta not to allow his son take certain medications.
"Absolutely not. It never happened. The Church never advised them on ... in ... in any way, shape or form, whatsoever, on any aspect of, uh ... of their son's treatment. Never have. And never will," Davis said.
Nightline: As you know, Mr. Travolta and his wife suffered a very great tragedy recently. ... Do you know if the Church ever advised them not to allow their son to receive certain medications for conditions?
Davis: Absolutely not. It never happened. The Church never advised them on ... in ... in any way, shape or form, whatsoever, on any aspect of, uh ... of their son's treatment. Never have. And never will.
The tragic death has lead to tabloid speculation that John Travolta might leave the Church of Scientology, something the Church and Travolta's publicist fiercely denied -- and last week, Travolta, his wife, Kelly Preston, and Tom Cruise were at major Scientology celebration in England.
The Church says there is no aspect of life that cannot be improved through the application of Scientology principles, some of which are treatments conceived by L. Ron Hubbard. One such procedure, popular with celebrities, is called the "purification rundown."
"It's a sauna and vitamin program, some exercise to get your heartrate going and ... you would take high doses of ... dosages of Niacin," said Amy Scobee.
Scientologists believe it can dislodge toxins and poisons from the body.