Everyone who disagrees with you on this topic is an Apikores? Are you sure it is not a koifer?
Would you be among those who burned the Ramabam’s sefarim or defending him? Every generation has kanayim. Unfortunately, the historical record is not favorable to fanaticism. Would you label someone who quotes from the Moreh a heretic? Someone who asserts that midrash is not literal or historical is outside the frum world?
My point is simple- There are core beliefs and practices that unite us as a community. There are particularities where there can be machlokes but still within the kahal. How one understands the metaphysical / spiritual state of klal yisroel nowadays should be your definition if they can count for a minyan? Do you understand there is no divergence in halachic practice! Are you contemplating a child shouldn’t sit shiva if the tatte is a frum tzioni who never missed a minyan and gave the daf shiur because he believed in their concept of reishis tzmichas geula? That is the halachic implication of an apikores.
For real? You use such a harsh term, perhaps it can be softened a bit? It is so easy to comment anonymously on chat forums without realizing the implications of hurtful speech. I say this with love for klal yisrael, even those I disagree with, they are still welcome at my shabbos tish.