I agree with protectionist and Death Angel and anyone else on this thread who has spoken out against this barbaric practice.
But that said, it isn't only Muslims who are doing animal sacrifices in the US. I honestly don't want to offend anyone here who might take this the wrong way... but as this video shows, there are also some Jewish sects who still do animal sacrifices yearly, in the streets of Brooklyn, and when you see what's going on, it is absolutely horrible.
Now I'm going to get even more controversial, and probably end up offending 98% of the people reading this thread (even though that is not my intent, but the truth must be told) what a man in that video who was participating in that ritual said actually had some truth to it. Animals are being abused and terrorized and brutally killed every day in slaughterhouses, so people can eat their dead bodies. So anyone who is truly opposed to animal cruelty also needs to look at what they are participating in, and supporting, by consuming animal products... and IF what is going on goes against their values, please be consistent and don't participate in it.