I would have preferred a more realistic, every days live story rather than cliché bashing.
The movie tries to take advantage of the tendency of western Europe to dislike religion, espacially catholicsm, even when it lost relevance in every days live for most people already. The bad traits of faith are just as much exaggerated to make a silly and funny impression but are also soften when it comes to move forward with clichés.
There is no explanation on how and why this couple came together and how the persons found together. The situations create the impression as if they just met rather than they shared parts of their lives together. The vast differences between the background of the persons would suggest either a deep bound between them or a clear separation. With the lack of any explanatiom, the couple is just used as basis to move forward with clichés.
Also very typical is to compare a very rare form of practicing cahtolicism, not accepted by catholics themselves, to how open and tolerate other religions and cultures are.
I liked the other two movies of the trilogie but this one was much to one sided following media stereotypes and lacking objective view on this topic.
I know people personally, who would provide better stories with what they experienced on their way finding faith and beyond. Stories who could possibly come true for any of us or could happen to our friends, providing a controversal view on how faith can save lives and the costs of it.