Answer:
His Faith in God has been deeply shaken by his experiences
Step-by-step explanation:
when he says he ceased to pray its implies he doesn't believe in god but when he said he was not denying his existence but his absolute justice, I believe it means he had been wronged for no reason and eh blames god for it, for if god was truly omnipotent he could have stopped it. but this is jusat my interpretation, I haven't read the book so if anything you should compare with other answers, if they are like this one then this is correct