Rav Shlomo Zalman Auerbach said that non-frum Jews nowadays are not in the category of Tinok Shenishba. If they (a) know they are Jewish, and (b) know that they have the option of being religious, and (c ) the government will not persecute them if they become religious, then, he said, if they say they still do not want to become religious, they are no longer in the category of Tinokos Shenishbu.
Menu