The Brisbane Times reports that Kidman told a US magazine that her Catholic faith affected her consideration of the script for the film, which is titled The Golden Compass.
The fantasy film is based on a novel by Philip Pullman called Northern Lights. It is already attracting attention in the US for avoiding much of the book's perceived anti-Catholic rhetoric.
Kidman said some of the religious elements were removed from the movie script.
Kidman told the magazine: "I was raised Catholic, the Catholic Church is part of my essence."
"I wouldn't be able to do this film if I thought it were at all anti-Catholic."
The Golden Compass is due for release in the US on 7 December.
Kidman denies film is anti-church (Brisbane Times, 19/8/07)