The award-winning duo behind the “Frozen” soundtrack say Disney only made them let go of one concept when writing the movie’s hit songs: God.

Speaking to NPR, Kristen Anderson Lopez, who together with her husband Robert Lopez wrote the Oscar-winning song “Let It Go,” said that putting religion into movies is a no-go for Disney brass.

“One of the only places you have to draw the line at Disney is with religious things, the word God,” she told Terry Gross on the Fresh Air program.

Before penning the songs for Frozen, Lopez was best known as co-creator of Broadway musical “The Book of Mormon,” which lampoons Mormonism, religion and Disney.

However he said Disney had no issue with bringing him on after that.

“I don’t think Disney has any problem with employing people who have, you know, done off color stuff in the past,” he said.

The animated movie Frozen, which tells the tale of a fearless princess on a quest to find her sister, has already drawn fire from conservative Christians for allegedly employing “pro-gay propaganda.

The song “Let it Go,” in particular was singled out by a writer for showing the lead character “coming out,” by “celebrating her acceptance of her true identity.”

The movie brought in over $1.1 billion worldwide, making it the highest grossing animated movie of all time.