Yeah, I'm convinced now that ALT timeline is Purgatory...and some cats like Ben and Ana Lucia weren't "ready" yet because they still had time left to serve before they could pass on to another world.
Purgatory in the sense that it was just their waiting place. Doesn't really mean there was a judgment placed on anyone. Maybe Ben not going inside the church meant he hasn't moved on yet, not that he wasn't invited.
THEY WERE IN A MULTI-DENOMINATIONAL CHURCH FOR A REASON. In the lower left corner, it looked like the one emblem of the stained glass was a donkey wheel. It only makes sense that their church gathering was the end of their lives and was a meeting place.
It doesn't mean that they died in the crash or anything. WHATEVER HAPPENED, HAPPENED. I think the final scene looked more like the original crash than something else. A sort of "and here is where it all began" type of scene.