Menachem, I do not have my own opinion. I simply follow the Gedolei HaPoskim and my Posek, as I mentioned. And they paskened what I told you. You aren’t in a position to tell anyone that they cannot follow certain Gedolei HaPoskim and must follow the ones that you choose or identify.
As far as the second point, I very much deal with non-Orthodox “Jews” very frequently. And I can tell you with a great deal of certainly that a large portion of those who self-identify as such or are affiliated with Reform and Conservative congregations are, in fact, Halachicly non-Jewish.