I think 'it depends' is the only answer.
All the cults have secrets. Even the most pacific, open cult has things that it doesn't want to be general knowledge. Some of that information will be available even to Initiates. So they are not happy about people who have been members taking that knowledge with them.
A person can become an 'inactive' initiate just by stopping paying his dues (attending Holy Days, paying tithes, giving Magic Points). It takes a deliberate magical act to sever a persons contact with the god completely.
If you leave 'by mutual agreement' then the cult would have agreed that you just weren't their sort of person. Keep your nose clean and never, ever get suspected of passing on their secrets and they'll let you live a normal life. If not they will take steps. What steps depends on the nature of the cult.
But if you join up with someone as serious as the Humakti and attempt to use their spiritual power as if they were a supermarket they are not likely to be pleased. If I knew that a PC was trying to join a cult with the expectation that he would leave after his own purposes were fulfilled then the God would refuse to initiate him. No die roll needed.
Actor And Genius
AKA Theophilus Prince Archbishop Of The Far Isles Medieval Society
Arms Purpure An Open Book Proper: On the Dexter Page an Alpha Or
On the Sinister an Omega Or. Motto Nulla Spes Sit in Resistendo
(Resistance is Useless). Ask me about the Far Isles:
Better Living through Pan-Medieval Anachronisms.
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