At the very least there should be a class in high school that teaches students about all the major world religions, their major sects, and their histories.
If in addition to agnosticism, atheism, and the views of the area's indigenous peoples I suppose it would be a good idea. Given the composition of many school boards, state legislatures, and so on however I fully expect that a mandated class on world religion would in practice become one about Protestant Christianity while treating alternatives in lectures and discussions as mythology.