Actually Hitler said so.
http://www.wsj.com/articles/book-re...nazi-germanys-war-by-david-motadel-1421441724
‘It’s been our misfortune to have the wrong religion,” Hitler complained to his pet architect Albert Speer. “Why did it have to be Christianity, with its meekness and flabbiness?” Islam was a
Männerreligion—a “religion of men”—and hygienic too. The “soldiers of Islam” received a warrior’s heaven, “a real earthly paradise” with “houris” and “wine flowing.” This, Hitler argued, was much more suited to the “Germanic temperament” than the “Jewish filth and priestly twaddle” of Christianity.
https://en.wikipedia.org/wiki/Relations_between_Nazi_Germany_and_the_Arab_world
"Hitler said that the conquering Arabs, because of their racial inferiority, would in the long run have been unable to contend with the harsher climate of the country. They could not have kept down the more vigorous natives, so that ultimately not Arabs but Islamized Germans could have stood at the head of this Mohammedan Empire"