In the temple of Hextor, location 3, pp.24-25, there is reference to a "large group" of cult fanatics, but a number is never given.
There are also many inconsistencies with the "Temple Organization" block regarding room #'s compared to the actual map. Hopefully this will be corrected if they create a hard cover for the AoW.
I think this is the fourth thread regarding this topic...you should always check past threads before starting a new one. There should be 7 - 9 cultists; 8 works fine to make it EL 3.