Alzrius
The EN World kitten
I think the issue isn't so much about real-world religion as it is about older belief systems (which informed a lot of classical literature, mythology, and yes, religions) with regard to collective punishments being handed down onto an entire group for the failure of one individual (usually a leader of some sort). You don't have to look very hard to find that particular idea in numerous tales from antiquity (and more recently, for that matter).I think defending mass murder- and make no mistake, that's the Cataclysm in a nutshell- as "good" is always going to fail. If you find that mass murder is somewhere in the grey area, well, we disagree about the borders of that grey.
Now, that conflicts drastically with contemporary attitudes, which strongly emphasize personalism with regards to moral culpability. And since alignment presents itself as the objective presence of Good and Evil, it's easy to see why some people reject any presentation of "absolute Good" that fails to adhere to the present understanding of morality.
That said, I think there's room to understand and enjoy a game setting where an older, alternative definition of Goodness (even in an absolute sense) is utilized, without any presumption that this necessarily means that the people who enjoy that are legitimately rejecting contemporary values.