“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.”