In teaching religion in schools, many things need to be kept in mind.
First, religion should be taught in religion class, not science or history.
Second, every religion should get a look in. If you're teaching one, you have to teach many. Including - in fact, especially - those ones that are largely misunderstood, such as Satanism.
Third, the religions should be taught in a somewhat objective way, without anything "one true way" or literal truth about them. However, they should also be done justice and taught with respect... but no proselytising, no converting, etc.
One is easy, two and three rather more difficult. While I find comparative religion fascinating, it's easier just to leave it out, or have it as an optional class.