There was a great moment in the Chef Returns episode (3.22.2006) where the head of the cult said his beliefs weren't any more silly than the beliefs of Christians, Jews or Muslims, though Kyle disagreed. This is a reference to the way a lot of people believe that one religion cannot be sillier than another since they all have rituals and believe in things that can't be true. Or, one's own religion is always less silly than others.
Some people define a "cult" as being a small religion even though you could say Christianity is a "cult" or used to be one.