I was a bit put off by the implied hostility there, even if it was in jest. It's a risky choice to jokingly discriminate based on religion, ethnicity or political affiliation, mostly because such a joke is hard to distinguish from almost identical contexts where it isn't a joke.
I'm an atheist too. I just gave a middle finger to the author and carried on reading.
I haven't really delved that much onto 9front but they do have an interesting style, see for example https://9front.org/propaganda/ yes it's probably going to rub people up the wrong way, but at least it isn't more corporate bs.
That said, making edgy joking is definitely acceptable, you'll just alienate part of your audience. That's why the hollow corporate bs doesn't do it.