However I am interested in the phenomenon of religion. I am presently writing a book on the evolution and adaptive value of belief.
Here's a book I read a long time ago looking at counselling/therapy from the point of view of people's religious or other deeply held beliefs, and the possible links between some kinds of religious world view and depression:
Dorothy Rowe - The Construction of Life and Death: http://www.amazon.co.uk/Construction-Life-Death-Dorothy-Rowe/dp/0006373844
Unfortunately I can't find any extracts or reviews of it online but if you're writing a book yourself it might be worth trying to find a copy. As I remember she comments on psychological and counselling theory being open to the discussion of sex but treating religious belief as a kind of taboo area, in contrast to pre-Freudian psychologists such as William James
who were happy to talk about religion but not about sex.