Why Teach About Islam in Public Schools?

I often find that the general public really has no idea that teachers are allowed to teach about the world’s religions in public schools. There’s a clear disconnect between what educators are doing and what the public thinks they can do. Then you add to this that people really don’t know that much about religions in general. The idea that a kid’s going to get converted by trying to write calligraphy, even if it’s a statement of faith — I mean, that seems like, really?