Secular Judaism is an oxymoron. All secular Jews need to do to be Jewish is observe mitzvot, at least the main ones, such as kashrut and Shabbat. Secular Jews in Isarel will soon see where their secularness brings their children and grandchildren. Just look at the progeny of secular Jews in the USA and the UK, and of many Israelis, even our national icons. They are mostly non-Jewish.
Israeli soldier collapses, dies from heatstroke during visit to Jerusalem's Old City (Haaretz)
from the article: Shahar Ilan / Ultra-Orthodox parties are Judaism's greatest enemies