That's pretty much the way it is now to some degree. In English we discuss the religious beliefs of the characters, in US history we compared the native American religions to the 7-day creation version. There is even a comparitive religion class in our school. So far with my experiences there hasn't been any bias, I think you're right it's important for people to know what others believe or they have no hope at understanding other people in society. As long as they don't advocate religion, it's fine to keep it informative as long as it pertains to the subject.
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