When I was a committed Christian I enjoyed reading the incredibly well-written and absorbing books by CS Lewis. I don’t mean the The Chronicles of Narnia, those classic novels for children, but his theological works. He has rightly been acclaimed as the greatest Christian apologist of the 20th century. My personal favourite is the famous The Screwtape Letters, a satirical novel written as a series of letters from a senior demon Screwtape to his nephew, a junior “tempter” named Wormwood, so as to advise him on methods of securing the damnation of a British gent known only as “the Patient”.

Arguably the most important work of 20th century Christian apologetics is Mere Christianity, in which Lewis tries to avoid denominational controversies in order to explain (what he sees as) the fundamental teachings of Christianity.  Remarkably, it seems his work is as popular amongst evangelicals as it is…