Religion in Sci-fi and Fantasy

It has been considered a rule of etiquette never to discuss politics and religion in general company for over one hundred years. Considering the potential those subjects have for starting arguments it is easy to see why. It's generally difficult to even write on religion except to an audience of coreligionists without giving someone offense. If a work intended only for coreligionists finds it's way into the hands of someone of another religion offense is almost inevitable. In science fiction and fantasy though this does not seem to be the case, most of the time. What makes these genre immune to generating conflict on such a sensitive subject?
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