How did Elie Wiesel struggle to maintain faith in the book Night?

No, although when the prisoners are lined up in front of the furnace, he asks God why it (the Holocaust) is being allowed to happen, he seems to lose his faith he never actually loses it. Looking at Moche the Beadle's teachings in the beginning of the book you can see that Moche taught Elie that although we may ask God questions we are not able to understand the answers. So although Elie asks God a question and is unable to understand the answer, which weakens his faith (if even that much), Elie still knows that there is hope in that he simply cannot understand God's answer and it is the teachings of Moche the Beadle which had helped Elie to keep his faith in God throughout his experiences in the concentrations camps, as well as the Holocaust.