C.S. Lewis on how some judge Christians:
I think this is the right moment to consider a question which is often asked: If Christianity is true why are not all Christians obviously nicer than all non-Christians? What lies behind that question is partly something very reasonable and partly something that is not reasonable at all. The reasonable part is this. If conversion to Christianity makes no improvement in a man's outward actions -if he continues to be just as snobbish or spiteful or envious or ambitious as he was before-then I think we must suspect that his "conversion" was largely imaginary; and after one's original conversion, every time one thinks one has made an advance, that is the test to apply. Fine feelings, new insights, greater interest in "religion" mean nothing unless they make our actual behaviour better; just as in an illness "feeling better" is not much good if the thermometer shows that your temperature is still going up. In that sense the outer world is quite right to judge Christianity by its results. Christ told us to judge by results. A tree is known by its fruit; or, as we say, the proof of the pudding is in the eating. When we Christians behave badly, or fail to behave well, we are making Christianity unbelievable to the outside world. The wartime posters told us that Careless Talk costs Lives. It is equally true that Careless Lives cost Talk. Our careless lives set the outer world talking; and we give them grounds for talking in a way that throws doubt on the truth of Christianity itself.
But there is another way of demanding results in which the outer world may be quite illogical. They may demand not merely that each man's life should improve if he becomes a Christian: they may also demand before they believe in Christianity that they should see the whole world neatly divided into two camps -Christian and non-Christian-and that all the people in the first camp at any given moment should be obviously nicer than all the people in the second. This is unreasonable on several grounds.
(1) In the first place the situation in the actual world is much more complicated than that. The world does not consist of 100 per cent Christians and 100 per cent non-Christians. There are people (a great many of them) who are slowly ceasing to be Christians but who still call themselves by that name: some of them are clergymen. There are other people who are slowly becoming Christians though they do not yet call themselves so. There are people who do not accept the full Christian doctrine about Christ but who are so strongly attracted by Him that they are His in a much deeper sense than they themselves understand. 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 other points. Many of the good Pagans long before Christ's birth may have been in this position. And always, of course, there are a great many people who are just confused in mind and have a lot of inconsistent beliefs all jumbled up together. Consequently, it is not much use trying to make judgments about Christians and non-Christians in the mass. It is some use comparing cats and dogs, or even men and women, in the mass, because there one knows definitely which is which. Also, an animal does not turn (either slowly or suddenly) from a dog into a cat. But when we are comparing Christians in general with non-Christians in general, we are usually not thinking about real people whom we know at all, but only about two vague ideas which we have got from novels and newspapers. If you want to compare the bad Christian and the good Atheist, you must think about two real specimens whom you have actually met. Unless we come down to brass tacks in that way, we shall only be wasting time.
(2) Suppose we have come down to brass tacks and are now talking not about an imaginary Christian and an imaginary non-Christian, but about two real people in our own neighbourhood. Even then we must be careful to ask the right question. If Christianity is true then it ought to follow (a) That any Christian will be nicer than the same person would be if he were not a Christian. (b) That any man who becomes a Christian will be nicer than he was before. Just in the same way, if the advertisements of White-smile's toothpaste are true it ought to follow (a) That anyone who uses it will have better teeth than the same person would have if he did not use it. (b) That if anyone begins to use it his teeth will improve. But to point out that I, who use Whitesmile's (and also have inherited bad teeth from both my parents), have not got as fine a set as some healthy young Negro who never used toothpaste at all, does not, by itself, prove that the advertisements are untrue. Christian Miss Bates may have an unkinder tongue than unbelieving Dick Firkin. That, by itself, does not tell us whether Christianity works. The question is what Miss Bates's tongue would be like if she were not a Christian and what Dick's would be like if he became one. Miss Bates and Dick, as a result of natural causes and early upbringing, have certain temperaments: Christianity professes to put both temperaments under new management if they will allow it to do so. What you have a right to ask is whether that management, if allowed to take over, improves the concern. Everyone knows that what is being managed in Dick Firkin's case is much "nicer" than what is being managed in Miss Bates's. That is not the point. To judge the management of a factory, you must consider not only the output but the plant. Considering the plant at Factory A it may be a wonder that it turns out anything at all; considering the first-class outfit at Factory B its output, though high, may be a great deal lower than it ought to be. No doubt the good manager at Factory A is going to put in new machinery as soon as he can, but that takes time. In the meantime low output does not prove that he is a failure.