Christianity

“Putting on Christ” [. . .] is not one among many jobs a Christian has to do; and it is not a sort of special exercise for the top class. It is the whole of Christianity. Christianity offers nothing else at all.

- Mere Christianity
Now the whole offer which Christianity makes is this: that we can, if we let God have His way, come to share in the life of Christ. If we do, we shall then be sharing a life which was begotten, not made, which always has existed and always will exist. Christ is the Son of God. If we share in this kind of life we also shall be sons of God. We shall love the Father as He does and the Holy Ghost will arise in us. He came to this world and became a man in order to spread to other men the kind of life He has—by what I call “good infection.” Every Christian is to become a little Christ. The whole purpose of becoming a Christian is simply nothing else.

- Mere Christianity
The Christian story is precisely the story of one grand miracle, the Christian assertion being that what is beyond all space and time, what is uncreated, eternal, came into nature, into human nature, descended into His own universe, and rose again, bringing nature up with Him. It is precisely one great miracle. If you take that away there is nothing specifically Christian left.

- God in the Dock
The real trouble about the set your patient is living in is that it is merely Christian. They all have individual interests, of course, but the bond remains mere Christianity. What we want, if men become Christians at all, is to keep them in the state of mind I call “Christianity And.” You know—Christianity and the Crisis, Christianity and the New Psychology, Christianity and the New Order, Christianity and Faith Healing, Christianity and Psychical Research, Christianity and Vegetarianism, Christianity and Spelling Reform. If they must be Christians, let them at least be Christians with a difference. Substitute for the faith itself some Fashion with a Christian colouring. Work on their horror of the Same Old Thing.

- The Screwtape Letters