The Kingdom of God is Within You by Leo Tolstoy Chapter 3 Page 6

The Christian doctrine is presented to the men of our world to-day as a doctrine which everyone has known so long and accepted so unhesitatingly in all its minutest details that it cannot be understood in any other way than it is understood now.

Christianity is understood now by all who profess the doctrines of the Church as a supernatural miraculous revelation of everything which is repeated in the Creed. By unbelievers it is regarded as an illustration of man's craving for a belief in the supernatural, which mankind has now outgrown, as an historical phenomenon which has received full expression in Catholicism, Greek Orthodoxy, and Protestantism, and has no longer any living significance for us. The significance of the Gospel is hidden from believers by the Church, from unbelievers by Science.