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Turks

In his last decade, he involved himself in the public policy debate on war with the Ottoman Empire, which was then invading Western Europe, notably in his book On the war against the Turks (1530), as the "reckless and extravagant" Pope Leo X had in previous decades promoted going on the offensive with a new crusade. Erasmus re-worked Luther's rhetoric that the invading Turks represent God's judgment of decadent Christendom, but without Luther's fatalism: Erasmus not only accused Western leaders of kingdom-threatening hypocrisy, he proposed a remedy: anti-expansionist moral reforms by Europe's disunited leaders as a necessary unitive political step before any aggressive warfare against the Ottoman threat, reforms which might themselves, if sincere, prevent both the internecine and foreign warfare.

In common with his times, Erasmus regarded the Jewish and Islamic religions as Christian heresies (and therefore competitors to orthodox Christianity) rather than separate religions, using the inclusive term half-Christian for the latter.

However, there is a wide range of scholarly opinion on the extent and nature of antisemitic and anti-Moslem prejudice in his writings: historian Nathan Ron has found his writing to be harsh and racial in its implications, with contempt and hostility to Islam.