"The Catholic Church banned music that contained polyphony (more than one musical part playing at one time), feeling that it would cause people to doubt the unity of God. The church also banned musical interval of an augmented fourth, the distance between C and F-Sharp and also known as a tritone (the interval in Leonard Bernsteins West Side Story when Tony sings the name "Maria"). This interval was considered so dissonant that must have been the work of the Lucifer, and so the church named it Diabolus in musica. It was the medieval church in an uproar."

Daniel J. Levitin.
From his book, This Is Your Brain On Music.

I hope there aren't Catholics that still think this way.