“The Holocaust was the product not of Christendom, but of Christendom's collapse. The destruction of Christendom effected (1) the rejection of Catholic natural law and (2) the rise of the absolute nation-state, previously impossible because popes could depose and counterbalance kings. Hitler, to be sure, contributed a neo-paganism and anti-Semitism all his own. But in mobilizing opinion and wielding power, he was helped more by these two innovations than by any Catholic doctrines.”

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 135.

This has often been quoted with modernized American spelling, rendering it "to civilize civilization and christianize Christendom?"
Source: White-Jacket (1850), Ch. 64

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 149.

Source: Books, Islam: The Religion and the People (2008), p. 146.

Obwohl die Juden auch nicht vor Angriffen auf das Christentum zurückschrecken, werden sie noch von denen geschützt, die das Priesterkleid tragen. Das Christentum der ersten Zeit war ein anderes als das heutige.
Die ersten Christen waren Kämpfer, die ihr Volk von der jüdischen Schmach befreien wollten. Dann stahl sich der Jude in diese Gemeinschaft ein und machte aus dem ursprünglich reinen Christentum ein Gespött der Menschheit. Die ersten Christen waren bereit, für die Erhaltung der christlichen Lehre zu sterben.
04/21/1932, speech in the Hercules Hall in Nuremberg ("Kampf dem Weltfeind", Stürmer publishing house, Nuremberg, 1938)

Source: 1850s, Attack upon Christendom (1855), p. 121

"Morning Telegraph" of London (January 5, 1938), reprinted in "Let the Record Speak", Dorothy Thompson, Boston: MA, Houghton Mifflin Company (1939) p. 135

The American Credo: A Contribution toward the Interpretation of the National Mind (1920)
1920s
Context: The American of today, in fact, probably enjoys less personal liberty than any other man of Christendom, and even his political liberty is fast succumbing to the new dogma that certain theories of government are virtuous and lawful, and others abhorrent and felonious. Laws limiting the radius of his free activity multiply year by year: It is now practically impossible for him to exhibit anything describable as genuine individuality, either in action or in thought, without running afoul of some harsh and unintelligible penalty. It would surprise no impartial observer if the motto “In God we trust” were one day expunged from the coins of the republic by the Junkers at Washington, and the far more appropriate word, “verboten,” substituted. Nor would it astound any save the most romantic if, at the same time, the goddess of liberty were taken off the silver dollars to make room for a bas-relief of a policeman in a spiked helmet. Moreover, this gradual (and, of late, rapidly progressive) decay of freedom goes almost without challenge; the American has grown so accustomed to the denial of his constitutional rights and to the minute regulation of his conduct by swarms of spies, letter-openers, informers and agents provocateurs that he no longer makes any serious protest.

Books, Islam and the West: A Conversation with Bernard Lewis (2006)