1914 is still a core doctrine but there's nothing major about it. There's not one single teaching that really matters or that couldn't be abandoned, this isn't a doctrinally driven faith anymore.
It's a social religion. People stay for as long as they follow the rules. They can leave if they no longer want to follow those rules or be kicked out if they're caught in violation of them (I'm simplifying I know).
1914, blood, perhaps even shunning could be dropped and there would still be a core following.
Perhaps the carrot of Paradise is the one thing that couldn't go