R&S: What is the best theological book whose beliefs you do NOT share, and why is it the best?

I can't say that I follow any religion precisely so I guess any theological book I have read and enjoyed is in the running as the Best. I love "drawing down the moon" for its ability to open your mind to earth based religions and" the year of living biblically" although it is not theological it made me want to follow the teachings of the bible.