I hate to say it, but I think almost all conversions are insincere. Very, very few, in my experience, believe down to their bones that the religion is true. Of course, I may be a bit jaundiced from my upbringing, but it is their actions that I watched.
Most of them are there for a group thing, there are some who pretend to ecstasy as they are singing for instance. Well, most people aren't that great of actors and I'd see the insincerity in their faces. For a while I tried to pretend, as I saw them doing, but then I just stopped.
Oh did you have to go to those things Damo? I've only seen them on tv, they look pretty ludicrous.