Hallo Rudif,
Being a Catholic, I would love to claim Lewis for Holy Mother Church, however - notwithstanding what are to Catholics unorthodox Anglican doctrines such as women priests, which Lewis would never have agreed with - I do not think he would necessarily have crossed the Tiber, so's to speak. I say that because there were Catholic doctrines in his day which he did not agree with and which have not changed since his day: Marian doctrines, for example.
Truth to tell, I think it is impossible to say which church Lewis would be a member of today. Have you read the Lord of the Rings? There is that bit where Gandalf tells Frodo that the important thing (in life) is to make use of the time that is alloted to one. Lewis did just that, died, and please God, went to his reward. His story, as Aslan might have said, ended there. To ponder where he would be now is to take the man out of his context.
The above is just my opinion. Like you I would still be interested to read other people's thoughts on the matter!
Malcolm
