What is Christianity? By Adolf Harnack Books / Paperback Books ISBN: 0061300179 / Publisher: Harper & Row (Torchbooks), January 1957 Price Starting at $5.65 Free Shipping Send to a friend Add to Wishlist Below is a list of products arranged by condition. Select the quantity of the product you desire and click the "Add" button. Used - Acceptable Acceptable condition. Cover and multiple pages hole-punched at top-right corner. $5.65 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store. Reviews Goodreads reviews for What is Christianity?