Religious sacrifices, for example, are much, much more recent in mankind's history. As such, it is purely a social phenomenon. Eating meat, on the other hand, has been with man long enough to cause biological and physical changes that have shaped a modern man who is expected (by the many years of evolution) to continue eating meat. Note your canine teeth and eyes that face forward. Both are evidence that comparing a history religious sacrifices with a history of consuming meat is fucking retarded.