(Denny Crane: "Sometimes you can only look for answers from God and failing that... and Fox News".)
More true than many people believe. My company started sponsoring a "Diversity" week during the summer when people from various cultures present artifacts and presentations about their home or ancestral lands during lunch. In the summer of 2001 I attended a presentation on Islam given by one of our employees, who was born and raised in Pakistan ("Land of the Pure", image if Hitler had renamed Germany "Reinland").
He had a slide show, which he said he had given a local schools, churches and other organizations. I found it to be highly insulting and presumptuous. The entire presentation had a Calypso Louie air of unreality about it. His thesis was that the relative change in power of Europe and decline in the fortunes of Islam was due to the discover of coal around 1500. It seems that coal made Europe habitable. ("No fair, man, youse guys is using coal!") He had maps depicting the spread of Islam at its height, circa 1400 and others showing predictions of its spread over all of Europe by 2050 and the entire planet at some point in the not too distant future. Imagine if a German-American had presented slides showing Grosser Deutschland in 1942 encompassing most of Europe and confidently predicting that by 2050 a resurgent Deutschland would encompass Europe and North Africa and by 2100 all of the Americas, Asia and Australia.