Currently, deity favor pools are shared between a god and their template demigods. So, for example, Fo gets favor from Nahjo prayers.
However, during a sermon, demigod favor doesn't seem to be reading from the template god's pool, which is misleading:
From a few hours prior:
Fo faith was definitely reading as "Fo is strong" as of a day ago, so it appears that Nahjo favor may properly be going to Fo, but sermons are still reading out Nahjo's favor accidentally. The Nahjo message provided is for the lowest tier of favor, which makes sense if all his favor is going to Fo as intended.