Well obviously I need to change my religious beliefs, I wonder if they have a specific type to sacrifice

Yup. I sacrifice 2 or 3 every year since I'm Mexican

I know this Mexican who sacrificed his 67 Chevy Impala for $800.

Tell her to stop watching Aztec Sacrifice documentaries on Netflix. Or better yet go along with it. Tell her be nice or Quetzalcoatl will come for her.

As an Irish Catholic, my people need to step up our game and bring back the Wicker Man apparently.

I think I know what she may be talking about. Now, it's been a few years since I've read about this, so some details might be off. The more fanatical Catholics in Brazil(?) go on a parade each year. Many of them whip their own backs with homemade cat-o-nine-tails. I never really understood self-flagellation, but whatever. And then usually one of them volunteers to be crucified, and it's some big honor to die in this fashion. So it's not really a sacrifice, but it is a ritualistic death. Of course, your grandmother might have been referring to something else or something nonexistent, but it definitely sounds like this weird tradition in particular.

Dont worry my grandma is completely brainwashed in the topic. Or everything for that matter. All she does is watch the news, make ignorant remarks.

Shhhhiiiiiitttttttt!!!!!!!!! My grandma watches the show run but Swaggart's wife, and believes everything she says. And yes, she wants to vote Trump. I live with my grandma. Please, kill me now. FML.

Don't you know that your grandmother is right. Every year they sacrifice a young woman named Catrina and dress her skeleton up for display during the Day of the Dead ...

Wrong religion. Also, about 500 years too late.