MOSHE S – Defining the word Apikores (Wiki).
Heresy in Orthodox Judaism (Hebrew: ??????????? kefira) is principally defined as departure from the traditional Jewish principles of faith. Mainstream Orthodox Judaism holds that rejection of the simple meaning of Maimonides’ 13 principles of Jewish faith involves heresy…
An alternative term, ???????? (Apiqoros/Apikoros), which may have a different status,[2] and is often used for apostates who turned towards agnosticism or atheism, is derived from Epicurus and the philosophy of Epicureanism.
I don’t know for sure, but I assume that the Satmar Rav, z”l was referring to the Secular Zionist when/if he used the term Apikores or Apikorses. The Secular Zionist are clearly in either of these two categories, Agnostics or Atheists. Anybody that believes in the Torah at best would have to follow “Religious Zionism”, not Secular Zionism. That’s in theory. The problem is that Religious Zionism is not divorced from Secular Zionism and thus many treif concepts of the Secularists have crept in to Religious Zionism. Perforce many of us have to unfortunately declare today’s Religious Zionism as Pasul.