Person1, you simply don’t like the halacha and prefer the pop-culture (and non-Jewish) concept of live and let live. Therefore you summarily dismiss Rav Moshe zt’l, Rav Zilber zt’l, the Pri Megadim and YBL”C Rav Chaim shlit”a that someone aware of Orthodox Judaism is not a tinok shenishba. You even have issue with the Chofetz Chaim himself who describes an apikorus as:
??????- “???????? ???? ????? ?????… ?????? ??? ???? ?? ????? ???? ?? ????? ??? ????? ???…”
As you know the vast majority of non-frum Jews reject the divine authorship of the entirety of the Torah. Many Torah statings they outright reject in accordance with their understanding of modern mores (i.e. the impermissibility of toeiva and even the application of the death penalty for such activity, among many other rejected Torah portions.)
And the Chofetz Chaim tells us to mock apikorsum:
“???? ?????? ?????? ??? ??? ????????? ????? ?????? ??????? ??? ?????? ???? ??? ??????”.
Thus, this would apply to most non-frum Jews, specifically those that reject even one pasuk in the Torah as coming directly from G-d Himself.
And as Rav Chaim Brisker famously said, ah nebech apikorus is oich an apikorus; even if they don’t realize rejecting one word of Torah makes them an apikorus, it still makes them exactly that.