There's plenty of stuff out there. Brown Rat is quite right in suggesting Frazer -- he's one of the best source materials for this sort of thing. Also very easy to find either new or used, and inexpensive.
But the facts of sacrifice aside, I see problems with the basic idea. Be careful how you handle it -- not worrying about offending people, as once you start worrying about that, you can find yourself tied up in knots -- but because, frankly, this sort of idea has been done to death in fantasy, horror, adventure stories, and the like. It has a terrible tendency to become trite, and that's something you'll want to avoid. You're going to have to be very careful to make it believable; and that's going to require some really strong characters that completely eschew stereotypical behavior, speech, and motivation. Otherwise you're in danger of simply doing a rehash of what's been done more times than I can count.
I'd say go for it, but do your very best to be completely original in handling this situation. The situation itself is old hat, but it's possible you can bring your own freshness to it and give it some new life nonetheless.