It's not about the topic—it's about the quality of the responses. If your post had been thoughtful and curious, rather than religious flamewar, that would of course have been fine.
I realize that when it's a topic you have strong pre-existing feelings and opinions about, the tendency to rush into the forum and vent them is very strong. It's not just you—we all have it. In order for HN to be the kind of forum we all want—something with the potential to remain interesting over time—we all need to find other ways to process those reactions in ourselves. Then the forum can be free for new exchanges, not just ranty repetition.
One thing to watch out for is whether you're responding to something specific and interesting in the article, or whether you're just taking its appearance as an opportunity to post generically what you think or feel about a large adjacent thing. As I've tried to explain many times here (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&sor...), discussion tends to get much less interesting—and also angrier—as it gets more generic, especially on divisive topics.
I think it's quite curious observation that for example the notion of perceived one-dimentionality of good and evil and their perceived additivity are both simplistically unrealistic and quite hard to shake off because of reinforcement coming from religions pervading our cultures.
But if you don't find that curious, but instead a generic incitement to religious flamewar it's fine by me.
I wonder if you also flagged the post itself, because for me it's a clearly a generic incitement to religious flamewar, because it postulates and praises influences of religion (and even a very specific one), which many people might find morally offensive.