I agree! Teaching about the origins and myths of religion, a comparison of the different religions, even a literary and historical study of the various religious works, such as the Bible, the Torah, the Koran, would not violate the separation of Church and State, provided those who are teaching it do not start preaching it. Supporting one religion over another, even supporting the idea of any religion over atheism, WOULD violate that separation, however.
Like it or not, religion has been, and remains, a major part of history and culture around the world. Learning about religion is necessary to our understanding of the world around us. I just don't see people in this country, at least, being able to easily separate the history from the theology.