"oh,no thanks. go ahead and take my rights. i never use them anyway." things like this happen because people let them happen.
Surly it's down to the parents wishes weather or not to teach any religion. It doesn't make any scence that teaching more then one religion will confuse children. People make the mistake of thinking of children as they are simple. I think it's better to teach children whatever religion/s you want to. Ultimatley the child will find his/her own path when they are ready. There are also a lot of stories lately of children being sent home from school for wearing religious pedants Crucifixes for example and in France there was that big story about Musslim girls being forbidden from wearing head scarfs. I just think people shouldn't be so uptight about religions.