I have known Mozart’s Don Giovanni for many years.
I never made any connection with it and Catholicism.
The libretto (the story and words) was written by Italian librettist Lorenzo Da Ponte, who worked with Mozart on several operas.
Da Ponte later moved to NY City in the US and luckily (for me—not for the clueless) left valuable information about what it was like to work together with Mozart while Mozart was directly in the middle of his creative process.
Da Ponte was an absolute revolutionary. Anyone who sees The Marriage of Figaro must see that. We have the Enzio Pinza version here - the voice of God speaking through Mozart and Pinza, of course.