This question essentially asks whether one's personality changes if one's belief system changes. It also asks whether it is possible to remain the same person even when life has been drained out of one, as it was from the victims.
At the beginning of the story Eliezer is a seeker. His main interest is less this life than it is the world of mysticism to which he wishes to gain access and with which he believes Moishe the Beadle will help him in his quest. The spiritual world is accepted as a given. In fact, it might even be more "real" to Eliezer than the actual, workaday world that physically surrounds him.
This is largely the personality of a dreamer. The shock of deportation and murder immediately changes his orientation to that of a questioner. He does not instantly conclude that God doesn't exist, but he asks why he and the others should sanctify God's name under these conditions. When he hears the others saying Kaddish, he asks if ever in Jewish history men have said Kaddish for...
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