So, they're alive on the island, dead in the church, but wasn't there a statement or two in the church that it was all just a stop on the way to the afterlife to prepare them for it? Kinda, like, ya know, purgatory? Or at the least a cop-out claiming no, they're not dead, but they weren't alive either? I've been thinking of re-watching this from the start anyway cuz I'm kinda masochistic that way, so maybe I'll just start with re-watching the final episode to see if my call of shenanigans still stands.