Other people have answered this question perfectly, but I think it bears noting that theoretically, were the temple to be rebuilt tomorrow, Judaism would demand that we sacrifice again. Whether or not we would actually do it (nevermind whether or not the temple will ever be rebuilt) remains up to debate.
However, it’s interesting to note that there are still religions that animal sacrifice is a part of. Muslims, I believe, still practice animal sacrifice. It’s not so unusual. In fact, I would suggest that part of our immediate negative response to the idea of sacrifice has a lot to do with the recent distance society and the meat industry have put between the killing of animals and their appearance on our dinner plate.
If we were still raised, or slaughtered our own livestock for food, then a ritual sacrifice might not seem so strange. Particularly if the sacrifice is then used as food.