Isn't 1 in 10 too many?

"[T]here are two unique aspects to the evil emanating from the Islamic world that render this latest threat to humanity particularly difficult to overcome. One is the number of people who believe in it. This is a new phenomenon among organized evils. Far fewer people believed in Nazism or in communism than believe in Islam generally or in authoritarian Islam specifically. There are one billion Muslims in the world. If just 10 percent believe in the Islam of Hamas, the Taliban, the Sudanese regime, Saudi Arabia, Wahhabism, bin Ladin, Islamic Jihad, the Finley Park Mosque in London or Hizbollah—and it is inconceivable that only one of 10 Muslims supports any of these groups' ideologies—that means a true believing enemy of at least 100 million people. Outside of Germany, how many people believed in Nazism? Outside of Japan, who believed in Japanese imperialism and militarism? And outside of universities, the arts world or Hollywood, how many people believed in Soviet-style totalitarianism? A far larger number of people believe in Islamic authoritarianism than ever believed in Marxism. Virtually no one living in Marxist countries believed in Marxism or communism. Likewise, far fewer people believed in Nazism, an ideology confined largely to one country for less than one generation. This is one enormous difference between the radical Islamic threat to our civilization and the two previous ones." —Dennis Prager