In response to people claiming that secular Israeli’s are “real” apikorsim: That is a mistake. Most of them are ANUSIM or at the very most shogegim. Most of them believe in God anyway. They just have been brainwashed from youth. Some just don’t believe they have to keep all the added Rabbinic laws. I know many people, including religious Jews, who believe the same about many Rabbinic laws on different levels. Also, those who start doing teshuvah, do try to keep the Torah to the best of their knowledge and ability.
Most importantly, a major factor in distancing those people from Torah is all the fighting, hate, and backward thinking among the religious (dati) Jews. I wouldn’t want to be “Orthodox” either if I were them.