How blood sacrifice is supposed to works

[Pocus]

After half a dozen of turns where a level 4 priest is sacrificing slaves, I'm starting to seriously doubt that each slave sacrified act as a temple... Even if the dominion in the province rised rather fast to his maximum, I have not been able to spread it in the neighborhood, 2 being provinces that I control and without enemy temples adjacent.

Its like the sacrifice influence is restricted to the province, and cant expand (kinda like uber priests preaching if you prefer).

I know its a mechanism seldomly used, so perhaps there is something wrong somewhere?