Low-rank lay member generic response is for Vvardenfell:
We accept all citizens of good character and earnest faith. We ask only a one-time pledge of 50 drakes to aid us in our good works. To become a lay member of the Imperial cult, speak with Ygfa at Fort Pelagiad, Syloria Siruliulus at Fort Buckmoth, Somutis Vunnis at Fort Moonmoth, Ruccia Conician in the Grand Council Chambers in Ebonheart, or Lalatia Varian in the Imperial Chapels at Ebonheart.

Default dialogue for topic shrines is the same as Tribunal Temple, should there be duplicates with "Cult" instead of Temple?
"Temple members and respectful guests may make offerings and receive blessings at shrines; the faithful of higher ranks need make no offering to receive blessings."