““I realised that C. S. Lewis was a superb apologist for Christianity, especially when he showed so splendidly that faith is not the same thing as being gullible, that Christianity, robust Christianity, is intellectually defensible, intellectually respectable.””
— - Desmond Tutu
C.S. Lewis doesnt provide any extra evidence for Christianity, and as such cannot make it anymore intellectually defensible or respectable. C.S. Lewis was actually a great person, and good Christian in the real sense but that makes his brand of Christianity morally defensible, and morally respectable. Not ‘intellectually’.