Keller & Inazu to Release ‘Uncommon Ground: Living Faithfully in a World of Difference’ CCM Magazine Staff March 9, 2020 How can Christians interact respectfully with those of different beliefs while remaining faithful to the Gospel? This is the crucial question best-selling author and Pastor Timothy Keller and Washington University Professor John Inazu sought to answer in their new book, Uncommon Ground: Living Faithfully in a World of Difference, to be released by Nelson Books April 14.