The initial conversation between Lenny and Brannox was an excellent scene and for a few moments I was thinking, "First season, The Young Pope; Second season, The New Pope; Next season, The Two Popes;" but it certainly didn't turn out that way!
I did believe that the fanatical Lenny worshipers could engage in such a violent, diabolical plot. Sadly, they were capable of horror in their unrelenting quest to uncover what had truly happened to Lenny. In my opinion, Sorrentino wanted to show that fanaticism in any major religion can lead to violence.
The one thing that bothered me--although it may have made for a good scene--was Voiello praying TO Girolamo, whom he considers a saint. As a (mostly lapsed) Catholic, I have had several in-depth discussions with Christians of other denominations who've told me that Catholics don't know how to pray properly because they pray TO saints. This is wrong. As Catholics, we ask the saints to pray FOR us. Litany of the Saints shows this (call and response prayer,) "St. Peter, pray for us; St. Paul, pray for us; St. Andrew, pray for us; St. James, pray for us; St. John, pray for us," and so on. The Hail Mary says, "Holy Mary Mother of God, pray for us sinners now and at the hour of our death." In showing a Cardinal(!) praying this way, Paolo Sorrentino just made my conversations a lot harder!
I did like that we got a glimpse of what the future held for many of the secondary characters, making it acceptable should this turn out to be not just a season finale but also a series finale. I do hope there will be another season though. I'd absolutely like to see what a Voiello papacy looks like.