"Leibowitz had a very negative view of Christianity as well as of modern Jewish thinkers like Rosenzweig and Buber, who showed intellectual and religious interest in Christianity. In contrast to scholars and thinkers like David Flusser, who investigated the Jewish roots of Christianity, Leibowitz wrote that the very concept of a "Judeo-Christian heritage" is a square circle. A synthesis or symbiosis is impossible; Christianity is for Leibowitz the adversary of Judaism. In his view, Christianity is the heir who does not want to admit that the testator is still alive. Judaism and Christianity cannot coexist, because Christianity claims that it is true Judaism, and is interested in the liquidation of Judaism as the religion of Torah and mitzvot."