Question

1. Does the Rabbi say the blessing “Who nourishes” out loud when leading a zimun? 2. I understood that in the Rabbi’s view, a secular Jew who does not believe in the obligation of the commandments from Sinai does not count toward a minyan. Is that correct? By the same logic, do we also not recite zimun with him? 3. Why do Ashkenazim not include a minor for zimun? I understood that the ruling in the Talmud is almost explicit (Rabbi Nachman) that he is included?