This is a collection of comments and quotes by CS Lewis I have found over the years. I took a class in the writings of CS Lewis when I was in college where we read 12 more of his books, not including the Chronicles of Narnia and discussed them. I also read and debated more of them in a Christian Literature Class, so I am quite familiar with what he wrote and claimed to believe or be open to. Our professor knew him personally.

Most people who hold to the beliefs sited below would be considered heretics by the church and the person’s state of grace questioned. The blanket acceptance of Lewis by many as a useful author or even Christian scholar is evidence of the dead state of much of professing Christendom today. He may have been an interesting fictional writer who wrote on Christian related topics, but not a sound or reliable teacher as you will find below. Lewis believed in evolution and denied that Christ was the only way to God, and did not believe the scriptures are the infallibly inspired word of God. He held to works salvation and purgatory. Did you miss this when you read his books?

CS Lewis was not an evangelical and definitely not a follower of the Protestant Reformation. He was a modern Anglican, basically a catholic of the English version, though not controlled by Rome, but continuing in much the same doctrine and practice.

Consider the danger in reading teachers with such erroneous beliefs, and especially letting children read them, because they may slip some false thoughts into the mind, at least, would it not be preferable and more edifying and glorious to God to read authors sound in the faith and endorse them and commend them as examples to others?

If one feels the liberty to read those like Lewis, as they would read other non-christian writings, or error laden religious works, then at least warn others of his errors and to be careful of picking up any false ideas from him. But consider, does not all we expose ourselves to influence our thinking?  Should we not seek to keep ourselves from the world and error that may influence our mind, and especially when it is posing as christian it is all the worse? Think on things that are good, pure lovely. If one called a brother walks in sin have no company with them is what scripture commands.

Lewis is popular because he is easy to read, and has a moralistic view of Christianity that even the unconverted can feel comforted that they follow and are in the faith. One who comments below raises a question, why quote Lewis. I would go farther to say, Why are we even reading Lewis, when there are so many much better Christian authors that will give you far more spiritual understanding and spiritual gain for your time.  And who are not so confused about scripture and God and do not expose people to being confused or misled by errors.
Based on quotes from Lewis below I would no longer read Lewis and have not in over 40 years since those college classes, nor would I recommend him to anyone and I discourage others from quoting him as an authority.  though a broken clock is right twice a day we would not recommend it as reliable. ~ DP

Lewis Believed Christ was not the only way to God and salvation. A pagan might actually belong to Christ without the gospel, though they don’t know it. 

“There are people in other religions who are being led by God’s secret influence to concentrate on those parts of their religion which are in agreement with Christianity, and who thus belong to Christ without knowing it … For example a Buddhist of good will may be led to concentrate more and more on the Buddhist teaching about mercy and to leave in the background (though he might still say he believed) the Buddhist teaching on certain points. Many of the good Pagans long before Christ’s birth may have been in this position” (Mere Christianity, pp. 176-177).

“I think that every prayer which is sincerely made even to a false god or to a very imperfectly conceived true God, is accepted by the true God and that Christ saves many who do not think they know Him.” (Letters of C. S. Lewis, 428.)

“I have the deepest respect for Pagan myths, still more for myths in the Holy Scriptures” (PP, p.71). CS Lewis

But God says:
Act 4:12 And there is salvation in no one else, for there is no other name under heaven given among men by which we must be saved.”

Prov 28:9 One who turns away his ear from hearing the law, Even his prayer is an abomination.  NKJV More