I don't mean to say they're in some form of afterlife, but that they're alive and on planet earth! Either they were brought to the island to be brought to the realization that they must now give up their lives to the devil, OR they were brought to the island so they could be delivered from him.

I think it's clear that Charlie is in the afterlife (did he sell his soul for Rock N Roll?) and hence my theory he is an angel trying to save them. If so, his selfless act to save the Losties probably redeemed him and that's how he became an angel. This isn't biblical, but the writers seem to combine religions, so it might fit in with the idea of karma.

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PIZZA?!?! Now that's what I call a TACO!!!