Now we are into the semantics of defining religion. Cults of personality are certainly cultish, but they’re not a fully formed religion substitute. SJ is, in my opinion, that.
In my opinion, the folks fighting SJ need to think about formulating a robust, fully formed replacement to occupy the same brainspace. And the folks within SJ need to be thinking about using their strongest feature, that being the update mechanic, to fix the holes in it. Either path, or both, would lead to a better situation than we have now.