What is the largest cult in the world?
Fiat currency and the belief in the central banks. Organised religion comes a close second in my opinion as every person in the world is living under fiat institutions forcing them to pay in fiat but you have the option to walk away from traditional religion and practise what you feel is correct.
They are all connected and dependent upon one another. Cannot discuss government, fiat, central banks or religion without getting the others involved in the conversation.