 He enrolled at the University of Michigan to pursue his studies under the biblical scholar George E. Mendenhall, who believed the Biblical account of an Israelite invasion of Canaan was incorrect, and that what actually must lie behind the biblical version was a kind of theocratic peasants' revolt from within Canaan.Glock, as a Lutheran missionary, came to Palestine in 1962 to work on excavations of Taanach, an ancient Canaanite city in south of Jezreel Valley.Raised to believe that every word of the Bible was 'inerrant', he is described by Sari Nusseibeh as settling down, at Birzeit, to swap a religious crusade for Palestinian nationalism.