23 You will need to watch carefully, Venerable Brethren, that religious fundamental concepts be not emptied of their content and distorted to profane use. "Revelation" in its Christian sense, means the word of God addressed to man. The use of this word for the "suggestions" of race and blood, for the irradiations of a people's history, is mere equivocation. False coins of this sort do not deserve Christian currency. "Faith" consists in holding as true what God has revealed and proposes through His Church to man's acceptance. It is "the evidence of things that appear not" ( Heb . ii. 1). The joyful and proud confidence in the future of one's people, instinct in every heart, is quite a different thing from faith in a religious sense. To substitute the one for the other, and demand on the strength of this, to be numbered among the faithful followers of Christ, is a senseless play on words, if it does not conceal a confusion of concepts, or worse.
Source: Mit Brennender Sorge (Vatican.va)