Well, C.S. Lewis wasn´t Jєωιѕн anyway!
He was a High Anglican (or Anglo-Catholic).
If anybody doesn´t know what Anglicanism is - it is the heretical "church" created in the 1500s by the English king Henry VIII when he split from Rome and it was continued by his descendents. Like Luther, Henry considered himself to be the head of a Catholic church purified of the Papacy. This "church" became more and more protestant until the 19th century when a movement started for Catholic renewal within the Anglican schism. Many Anglican clergymen started propagating Catholic beliefs such as the Virgin birth, transubstantiation, the sacrament of the Priesthood, priestly celibacy which had been previously dropped from the Anglican agenda. They also restored most Catholic rituals and were greatly persecuted by the protestant order, including Queen Victoria who was the lowest type of Lutheran.
Unfortunately for the High Anglicans, the validity of their Holy Orders was not recognised by the Pope and there was no dialogue.
The great English Cardinals Manning and Newman were formerly Anglican clergymen who could no longer be part of a heretical schism.
Many Anglicans became Catholics including very many famous authors.
CS Lewis was very close to the Church but never actually became a Catholic (as far as I know!)
His writings could be considered to be very Orthodox Catholic - containing no heresies and CERTAINLY much closer to traditional catholic teachings than any Novus modern Jesuit errors.
Dorothy Sayers, the writer of detective fiction (Lord Peter Wimsey) was also a High Anglican whose religious writings have been endorsed by traditionalist Catholics.
But the good thing is that since the Anglican schism has gone COMPLETELY off the rails and starting "ordaining" women, as well as practising ɧoɱosɛҳųαƖ, "priests" whole parishes have realised where they should have been all along and come over to the Church (where they are - presumably - traditional)