That's so weird. What do they teach in American schools? Apparently not even basic geography? The fact that Indonesia was Muslim is something I learned very early on - certainly before high school.

TBH, without going into overmuch detail, I wouldn't generalize from my educational experience to the American educational system as a whole. I think it was better in a lot of ways, and worse in a few ways, than what most people would have received, and I wouldn't be surprised if there were some particular holes in my knowledge due to taking part in multiple curricula from different institutions.