And what religion has gone ahead and done it without permission, and had zero repercussions?
If you have built shrines in Zuma territory, now that the SA is running around the area the Zuma can actually LOCATE them. How long is that zero repercussions going to last if they inform the Zuma? If you are just referring to preaching cross over from preaching in adjoining regions, really is that something to crow about? If the Zuma declared war on you for preaching in your own regions the GM would simply have to go through yet another round of bitching.