When I shared the recent post, Many Atheists Are Not Secular Activists, on Medium, I got a great comment in response. The commenter noted that he almost skipped over it because he saw "secular activist" in the title and thought, "I'm not a secular activist." He didn't think it applied to him because he assumed "secular activist" referred to "...one of those atheists who works to convince others that atheism is the only correct way of thinking." But it did apply to him.
Then reading between the lines of your story I realized you meant secular activism as working against problems caused by people not observing proper separation of church and state.
I do that all the time.
It just never would have occurred to me to call it secular activism.