At the end of the novel Jason has no more faith than he has in the beginning: "I have a religion, but I have no faith" (31.52). Despite creating a religion and gathering a small flock of believers, he's left with "no church, no money, and only one member" (31.52). So has his whole journey been for nothing?
One result of all the tower-climbing fallout is the direct heart-to-heart conversation Jason has with his dad. If there hadn't been hospitalizations and arrests, would Jason's dad have accepted Jason's agnosticism and allowed him to choose whether to continue attending church and TPO? Would Jason have stepped out of his goofy cynicism long enough to really evaluate what makes others' faith tick? He comes to realize he envies his father's "unshakable belief in the Catholic Church" and notes that "his faith gives him power and contentment" (31.198).
We think that while Jason hasn't undergone a tremendous change of belief, he's matured a great deal in terms of tolerance and respect. What do you think?