" What is Christianity? Christianity is that which brings a man or woman to a knowledge of God. Take our Lord’s own definition of eternal life: “This is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.” That is Christianity—knowing God, not just believing a few things about God and living a nice little life. That is not Christianity. That is often nothing but morality or mere religion. The essence of this is entering into this realm into which you begin to know and have communion with the Father and the Son and the Holy Spirit. "

― D. Martyn Lloyd-Jones , Experiencing the New Birth: Studies in John 3