Teaching Christian Morality, based on the Constitutional philosophy of Individual Freedom and Equality is not unconstitutional. Teaching the faith-based religious dogma as the basis is. It has to be framed in a philosophical context, rather than being framed in the context of mythology. Again, it's the point of the resulting subjective morality, not the specific dogma.
It's easy within the context of a Comparative Religion class. The Christian philosophy of Individual Freedom and Equality easily wins out.
