Patch notes list this side quest, as it should have a quest marker.
But when clicking on "show on map" the sole marker is at the Dog Isle (to capture the pin)
Johnny mentioned the name of specific church, but as I was certain, that I will need just follow a normal quest marker for navigation, I did not write it down.
Visited two churches, but couldn't find any hymn book.
Any leads?
Also, speaking of lead, the quest of "bring 4 lead" - is this infinite quest? I brought 4 already, but it is still not complete and that dude still is ready to take more (while I don't recon any reward at all)

The hymn book is in a church on the dogs isle that has no marker itself. A pretty tiny building with 2 scrappers inside.
If you have no marker, did you really update folon or did gog just download the update? Did folon tell you when loading a savegame that it got updated?

I don´t know if bullettooths quest is bugged, i stopped giving him more lead after the second time as i needed that stuff on my own. Added then 200 lead to my inventory feeding him and he never stopped. So either bugged or just some optional thing to fix your reputation, don´t know.