Re Taxing temples: Makes sense to have this as an option for realms, if they want to tax temples. However, I worry about what this will do to temple funding. This will be a serious drain on temples, requiring them to be visited much more frequently to keep the treasury stocked so they don't fall apart.
Re Taxing SSs: Wut? This makes no sense. The reason the treasury cap was put in place for SSs is because they are not taxed.
I second both of these sentiments. Keeping a religion funded takes work as it is. To tax them in addition would make it even more onerous. Religions and guilds both add a lot of flavor to the game, yet I personally have sworn off founding guilds precisely because of how much of a pain in the neck they are to manage from a financial standpoint.
And yes, the SS thing makes no sense at all.
