Baloon animals

"My grandfather was Jewish so I'm a quarter Jewish." There's nothing special about that, it's just the way it is. However: "my grandmother was Muslim so I'm a quarter Muslim" or "my mother is a Hindu so I'm half Hindu" doesn't work as well. Why is that? You can't inherit religion like you can with eye colour or colour blindness. It's not something at the tip of the x-cromosome that injects you with religion. You can grow up with the culture and the traditions of a religion, but you can't inherit it, it's technically impossible. Yet people don't seem to know this. They seem to think that it's perfectly alright to call themselves "a quarter Jewish" like others would refer to themselves as a "quarter Irish". I've known a lot of Muslims in my days and not a single one of them have ever referred to themselves as "half/quarter/three eights Jewish". Maybe I should refer to myself as a "quarter Christian". Not that I know for sure if my grandparents were Christians, but I assume more or less everyone in Sweden was 80 years ago. Then again, considering only one of my grandparents was Swedish maybe I have parts of other religions in me aswell. I might be both Catholic and Protestant (yes yes, I know it's the same thing and that they differ on divorce and contraception, but it's more fun this way), Jewish, Muslim. Who knows - I might even be a Buddhist or a Hindu! Oh, the suspense!