God, Jesus, the Bible, the apostles said we basically are not to judge the non Christians in regard to their spirituality, or to judge other Christians in regard to their lack of observance of the old testament ritual laws now too, but we are to judge all of the professing Christians, to judge even as the type of fruit they bear now too, whether they are keeping the ten commandments, are now really true to the faith.. and even to rebuke them, openly if they do not. But first actually read the Bible and see this for yourself..
(Phil 2:15 KJV) That ye may be blameless and harmless, the sons of God, without rebuke, in the midst of a crooked and perverse nation, among whom ye shine as lights in the world;
(1 Tim 5:20 KJV) Them that sin rebuke before all, that others also may fear.
(2 Tim 4:2 KJV) Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine.
(Titus 1:13 KJV) This witness is true. Wherefore rebuke them sharply, that they may be sound in the faith;
(Titus 2:15 KJV) These things speak, and exhort, and rebuke with all authority. Let no man despise thee.
(Rev 3:19 KJV) As many as I love, I rebuke and chasten: be zealous therefore, and repent.
(Mat 5:25 KJV) Agree with thine adversary quickly, whiles thou art in the way with him; lest at any time the adversary deliver thee to the judge, and the judge deliver thee to the officer, and thou be cast into prison.
(Luke 12:57 KJV) Yea, and why even of yourselves judge ye not what is right?
(Luke 19:22 KJV) And he saith unto him, Out of thine own mouth will I judge thee, thou wicked servant. Thou knewest that I was an austere man, taking up that I laid not down, and reaping that I did not sow:
(John 5:30 KJV) I can of mine own self do nothing: as I hear, I judge: and my judgment is just; because I seek not mine own will, but the will of the Father which hath sent me.
(John 7:24 KJV) Judge not according to the appearance, but judge righteous judgment.
(John 8:15 KJV) Ye judge after the flesh; I judge no man.
(John 8:16 KJV) And yet if I judge, my judgment is true: for I am not alone, but I and the Father that sent me.
(John 12:47 KJV) And if any man hear my words, and believe not, I judge him not: for I came not to judge the world, but to save the world.
(John 12:48 KJV) He that rejecteth me, and receiveth not my words, hath one that judgeth him: the word that I have spoken, the same shall judge him in the last day.
(Acts 10:42 KJV) And he commanded us to preach unto the people, and to testify that it is he which was ordained of God to be the Judge of quick and dead.
(1 Cor 5:12 KJV) For what have I to do to judge them also that are without? do not ye judge them that are within?
(1 Cor 6:2 KJV) Do ye not know that the saints shall judge the world? and if the world shall be judged by you, are ye unworthy to judge the smallest matters?
(1 Cor 6:3 KJV) Know ye not that we shall judge angels? how much more things that pertain to this life?
(1 Cor 6:4 KJV) If then ye have judgments of things pertaining to this life, set them to judge who are least esteemed in the church.
(1 Cor 6:5 KJV) I speak to your shame. Is it so, that there is not a wise man among you? no, not one that shall be able to judge between his brethren?
(1 Cor 10:15 KJV) I speak as to wise men; judge ye what I say.
(1 Cor 11:31 KJV) For if we would judge ourselves, we should not be judged.
(1 Cor 14:29 KJV) Let the prophets speak two or three, and let the other judge.
(Col 2:16 KJV) Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
(Rev 19:11 KJV) And I saw heaven opened, and behold a white horse; and he that sat upon him was called Faithful and True, and in righteousness he doth judge and make war.
the true Christian lives by faith in God.. Did CS Lewis have faith in God that God would save him in spite of CS Lewis being imperfect, a sinner… the clear answer seems yes.