I was just trying to help the OP understand that there are different types of "Satanists" though. Lots of times the people that think they're going to get somewhere by being "evil" and Satanic are mentally ill. I am aware of other religions that sacrifice animals but that's a different thing. I still don't think it's cool but I'm not going to call it evil. I don't eat animals so eating it after doesn't matter to me.
The OP is talking about evil which is why I used that word but I do understand that many people do not consider Satan to be evil. In the end there is no easy way to answer the question and OP needs to do a lot of research. I was only trying to say that there are lots of different kinds of Satanists.