I think the interpretation that its about Jesus is very interesting and it does make sense. However, I remember hearing Billy Corgan say that the song is called "thirty three" because when he was very happy in his relationship with his ex-wife a psychic told him his life would change very much when he was 33. I think the words are directed at his ex-wife. He's saying that regardless of anything that happens or what anyone says their love for each other can last forever.