At school today my health teacher was talking about alcohol. She got to the topic of The blood of Christ. She started to tell us that it wasn't true, it was just poison in a fancy cup. Most of my class is Catholic, so we wanted to know what to do.
Depends if your in a public or private school. Because In public schooling religion shouldnt be brought up in a educating system because of everyones opinion. You could just tell your teacher it offended you and a couple of other kids in your class and ask if she could refrain from bringing up any religious topics again. And if you dislike it. You could always go up to your principle and talk the issue over with him/her