The duo said that Disney was not a sanitised corporate environment, reported The Guardian.
"One of the only places you have to draw the line at Disney is with religious things, the word God. You can say it in Disney but you can't put it in the movie," they said.
The revelation is likely to draw the ire of conservative Christian commentators who have already targeted 'Frozen' for its supposed pro-gay propaganda.
In March, Pastor Kevin Swanson of the Reformation Church, denounced the film as "very evil", and that Disney was "one of the most pro-homosexual organisations in the country".
According to Lopez it took just a day and a half to finish writing.