I was hoping for more in depth information and insight to the Geisha...maybe more about their daily lives. I have lived in Japan and was in Kyoto and got to talk to several Maiko (geisha-in-training) and Geisha, which was very interesting.
I found Geisha Culture and Religion to be a good overview, and the author obviously knowledgeable on Japanese culture and language. However, if you're hoping for an inside view, this book doesn't deliver. There's very little about Geisha religion referred to in the title--an odd topic anyway since Geisha aren't involved in matters of religious significance, and most Japanese people will say they are not religious, nor follow a particular religion or faith.
For an insider's view of Geisha and personal experience, I highly recommend Liza Dalby's written an excellent book in a new edition that goes into the details of becoming a real-life Geisha, the women who choose that path and their daily lives. Geisha