“If he can’t rely on it, it makes him into apikores. Call a spade a spade”
Like Poppa said, perhaps in regards to how we treat a person, we need to have a method of classification, but again that is not what I am discussing. In that issue, this might be no different than any halachic issue. But I am discussing whether the person himself is in reality an apikores and whether he will have a share in the world to come or not.