This is the "of course" reaction of the Christian, was my reaction first studying the Ezekiel temple, that sacrifices cannot be. I don't recall the details, but I once accepted an explanation it was commanded to be built, but never built, as the Jews rejected Jesus Christ at His first advent, but that God provisioned for a path of obedience. I've long since rejected this theory, on account of explicit detail and detail that places the temple in the millennium.If you refuse to go from here, that the temple is real and is in the millennium, then just forget the rest. (The rest becomes beside the point, if you reject the foundation.) But if you see this, there is animal sacrifice, various sacrifices. Read the account in the Bible and study it. The sacrifices are there and the whole ceremonial system different than existed in Judaism before, the structure of the temple in terms of the players and the sacrifices different that existed in Judaism before. Study it, and then begin with an informed comment.