Pope-emeritus Benedict XVI exchanges letters with noted atheist philosopher - Vatican Radio

(Vatican Radio) Pope-emeritus Benedict XVI has had an exchange of letters with the noted Italian mathematician and philosopher, Piergiorgio Odifreddi, excerpts from which appeared in the Tuesday edition of the Italian daily, La Repubblica. At the beginning of September, Benedict sent a lengthy and detailed response to criticisms the atheist thinker Odifreddi had published in his volume, Caro papa ti scrivo, a book-length essay that was itself a critique of certain arguments and lines of thought found in the Pope-emeritus’ theological writings, starting from his 1967 volume, Introduction to Christianity.

Above from and continued here: 
Radio Vatican News - Pope Emeritus Benedict XVI exchanges letters with atheist