The English title is "I Sold My Soul on Ebay". The German is "Biete Seele Such Gott!"
From the comments:
It is an odd title indeed. It’s two imperatives: “Offer (your) soul; Seek God!”
“What an atheist experienced in Christian Communities.”
Is that really what you want to have as the initial impression for people who pick up this book in the store?
The conversation is rather interesting. I don't know a lick of German, unfortunately.