In modern times, “proselytism” has acquired the meaning of disrespectful, aggressive, intrusive, crass propagandizing. This was the sense in which the Pope was using the word.
In the Catholic world (and the Pope is a Catholic), the term used for respectful sharing of the Gospel, which includes teaching by quiet example, is “evangelization.”
When I examine my dictionaries I find no such definition of “proselytize”. Again let us use words to mean what they mean. No Owellian doublespeak.