Dear Reb Eliezer,
The majority of people are not Jews. Rov says that they all are Goyim. An outsider who shows up in a community does not have a chezkas kashrus. One who does not keep Shabbos is a mechalel Shabbos. There is no reason to doubt his Jewishness.a tinok shenishba is a Jew.
Whatever you just posted, makes no sense to me. Please explain.