A Jew who denies the tenets of Judaism or the validly of the Oral Torah, or who publicly violates Shabbos or does any
aveira to disturb Hashem, is treated as a
goy and cannot be counted towards a
minyan. Someone who was raised among non-Jews (
tinok shenishbah) and was not taught about Torah is treated as a full Jew and can be counted towards a
minyan. Some recent
poskim view the majority of today's irreligious people as
tinokos shenishbu and consider them full Jews. According to other
poskim, since information about Judaism is readily available -- particularly in Eretz Yisrael where the religious and non-religious live together -- the non-religious are treated as refusing to observe the Torah and are considered as non-Jews. A third opinion is lenient in times of need.
(
ס"ק מו-מז; ביאורים ומוספים דרשו, 58-59)