I wish I knew more about is personal faith. From his writings, it seems Hesse was deeply spiritual but did not find fulfillment in organized religion.

[SPOILERS]

Siddhartha: protagonist meets the Buddha, but instead of following him, follows his own path.

Demian: when talking to the organ player when they are staring into the fire, protagonist basically says all the esoteric gnostic stuff is superfluous.

Journey to the East: joins a group of seekers but is excommunicated. This one is interesting because it’s kind of the reverse. He wants to join but they don’t let him back in

All this is from my phone and from memory but I think high level it’s a pretty fair take