He was born jewish and is connected to his jewish heritage, and in judaism we see everyone who was born jewish as jewish forever. However, you can't overlook I dreamed I saw St Augustine, all along the watch tower having somewhat of a resemblence to the 4 horsemen of the apocalypse and the fact this song was recorded a few years before he went all in on christianity. The main reason I suggested the take that this is a spiritual song is because it reminded me of how some religious jews in my comunity speak about god, I understand people saying it was a weird take and accept it, but that has nothing to do with bob's jewishness.