What does elie say has taken place within him

I thionk his faith has been shaken:

"I too had become a different person. The student of Talmud, the child I was, had been consumed by the flames. All that was left was a shape that resembled me. My soul had been invaded—and devoured—by a black flame. So many events had taken place in just a few hours that I had completely lost all notion of time. When had we left our homes? And the ghetto? And the train? Only a week ago? One night? One single night?"