The following passages were written in 1916 in Teddy Roosevelt’s book, “Fear God and Take Your Own Part”, reproduced in “What Every American Needs to Know About the Qur’an” by William Federer.
Christianity is not the creed of Asia and Africa at this moment solely because the seventh century Christians of Asia and Africa had trained themselves not to fight, whereas the Moslems were trained to fight. Christianity was saved in Europe solely because the peoples of Europe fought. If the peoples of Europe in the seventh and eighth centuries, an on up to and including the seventeenth century, had not possessed a military equality with, and gradually a growing superiority over the Mohammedans who invaded Europe, Europe would at this moment be Mohammedan and the Christian religion would be exterminated. Wherever the Mohammedans have had complete sway, wherever the Christians have been unable to resist them by the sword, Christianity has ultimately disappeared. From the hammer of Charles Martel to the sword of Sobieski, Christianity owed its safety in Europe to the fact that it was able to show that it could and would fight as well as the Mohammedan aggressor… The civilization of Europe, American and Australia exists today at all only because of the victories of civilized man over the enemies of civilization because of victories through the centuries from Charles Martel in the eighth century and those of John Sobieski in the seventeenth century. During the thousand years that included the careers of the Frankish soldier and the Polish king, the Christians of Asia and Africa proved unable to wage successful war with the Moslem conquerors; and in consequence Christianity practically vanished from the two continents; and today, nobody can find in them any “social values” whatever, in the sense in which we use the words, so far as the sphere of Mohammedan influences are concerned.There are such “social values” today in Europe, America and Australia only because during those thousand years, the Christians of Europe possessed the warlike power to do what the Christians of Asia and Africa had failed to do — that is, to beat back the Moslem invader.